19 files changed, 1581 insertions, 633 deletions

diff --git a/library/CustomGrid.cpp b/library/CustomGrid.cpp
index 25ceb537..95300a2b 100644
--- a/library/CustomGrid.cpp
+++ b/library/CustomGrid.cpp
@@ -3,24 +3,28 @@
 #include "resources.h"
 #include <wx/dc.h>
 #include "../algorithm.h"
+#include "resources.h"
+
+using namespace xmlAccess;
+
 
-const unsigned int MinimumRows = 15;
+const unsigned int MIN_ROW_COUNT = 15;
 
 //class containing pure grid data: basically the same as wxGridStringTable, but adds cell formatting
-class CustomGridTableBase : public wxGridStringTable
+class CustomGridTable : public wxGridTableBase
 {
 public:
-    CustomGridTableBase(int numRows, int numCols) :
-            wxGridStringTable(numRows, numCols),
+    CustomGridTable() :
+            wxGridTableBase(),
             lightBlue(80, 110, 255),
             lightGrey(212, 208, 200),
-            gridIdentifier(0),
-            gridRefUI(0),
-            gridData(0),
-            lastNrRows(MinimumRows) {}
+            gridRefUI(NULL),
+            gridData(NULL),
+            lastNrRows(0),
+            lastNrCols(0) {}
 
 
-    ~CustomGridTableBase() {}
+    virtual ~CustomGridTable() {}
 
 
     void setGridDataTable(GridView* gridRefUI, FileCompareResult* gridData)
@@ -30,182 +34,56 @@ public:
     }
 
 
-    void SetGridIdentifier(int id)
-    {
-        gridIdentifier = id;
-    }
-
 //###########################################################################
 //grid standard input output methods, redirected directly to gridData to improve performance
 
     virtual int GetNumberRows()
     {
         if (gridRefUI)
-            return max(gridRefUI->size(), MinimumRows);
+            return std::max(gridRefUI->size(), MIN_ROW_COUNT);
         else
-            return MinimumRows; //grid is initialized with this number of rows
+            return 0; //grid is initialized with zero number of rows
     }
 
 
-    virtual bool IsEmptyCell( int row, int col )
+    virtual int GetNumberCols() //virtual used by middle grid!
     {
-        return (GetValue(row, col) == wxEmptyString);
+        return columnPositions.size();
     }
 
 
-    wxString evaluateCmpResult(const CompareFilesResult result, const bool selectedForSynchronization)
+    virtual bool IsEmptyCell( int row, int col )
     {
-        if (selectedForSynchronization)
-            switch (result)
-            {
-            case FILE_LEFT_SIDE_ONLY:
-                return wxT("<|");
-                break;
-            case FILE_RIGHT_SIDE_ONLY:
-                return wxT("|>");
-                break;
-            case FILE_RIGHT_NEWER:
-                return wxT(">>");
-                break;
-            case FILE_LEFT_NEWER:
-                return wxT("<<");
-                break;
-            case FILE_DIFFERENT:
-                return wxT("!=");
-                break;
-            case FILE_EQUAL:
-                return wxT("==");
-                break;
-            default:
-                assert (false);
-                return wxEmptyString;
-            }
-        else return wxT("(-)");
+        return (GetValue(row, col) == wxEmptyString);
     }
 
 
-    virtual wxString GetValue(int row, int col)
-    {
-        if (gridRefUI)
-        {
-            if (unsigned(row) < gridRefUI->size())
-            {
-                const FileCompareLine& gridLine = (*gridData)[(*gridRefUI)[row]];
-                wxString fileSize; //tmp string
-
-                switch (gridIdentifier)
-                {
-                case 1:
-                    if (col < 4)
-                    {
-                        if (gridLine.fileDescrLeft.objType == FileDescrLine::TYPE_DIRECTORY)
-                        {
-                            switch (col)
-                            {
-                            case 0: //filename
-                                return wxEmptyString;
-                            case 1: //relative path
-                                return gridLine.fileDescrLeft.relativeName;
-                            case 2: //file size
-                                return _("<Directory>");
-                            case 3: //date
-                                return wxEmptyString;
-                            }
-                        }
-                        else if (gridLine.fileDescrLeft.objType == FileDescrLine::TYPE_FILE)
-                        {
-                            switch (col)
-                            {
-                            case 0: //filename
-                                return gridLine.fileDescrLeft.relativeName.AfterLast(GlobalResources::FILE_NAME_SEPARATOR);
-                            case 1: //relative path
-                                return gridLine.fileDescrLeft.relativeName.BeforeLast(GlobalResources::FILE_NAME_SEPARATOR);
-                            case 2: //file size
-                                return globalFunctions::includeNumberSeparator(fileSize = gridLine.fileDescrLeft.fileSize.ToString());
-                            case 3: //date
-                                return FreeFileSync::utcTimeToLocalString(gridLine.fileDescrLeft.lastWriteTimeRaw);
-                            }
-                        }
-                    }
-                    else
-                        assert (false);
-
-                    break;
-
-                case 2:
-                    if (col < 4)
-                    {
-                        if (gridLine.fileDescrRight.objType == FileDescrLine::TYPE_DIRECTORY)
-                        {
-                            switch (col)
-                            {
-                            case 0: //filename
-                                return wxEmptyString;
-                            case 1: //relative path
-                                return gridLine.fileDescrRight.relativeName;
-                            case 2: //file size
-                                return _("<Directory>");
-                            case 3: //date
-                                return wxEmptyString;
-                            }
-                        }
-                        else if (gridLine.fileDescrRight.objType == FileDescrLine::TYPE_FILE)
-                        {
-                            switch (col)
-                            {
-                            case 0: //filename
-                                return gridLine.fileDescrRight.relativeName.AfterLast(GlobalResources::FILE_NAME_SEPARATOR);
-                            case 1: //relative path
-                                return gridLine.fileDescrRight.relativeName.BeforeLast(GlobalResources::FILE_NAME_SEPARATOR);
-                            case 2: //file size
-                                return globalFunctions::includeNumberSeparator(fileSize = gridLine.fileDescrRight.fileSize.ToString());
-                            case 3: //date
-                                return FreeFileSync::utcTimeToLocalString(gridLine.fileDescrRight.lastWriteTimeRaw);
-                            }
-                        }
-                    }
-                    else
-                        assert (false);
-
-                    break;
+    virtual wxString GetValue(int row, int col) = 0;
 
-                case 3:
-                    if (col < 1)
-                        return evaluateCmpResult(gridLine.cmpResult, gridLine.selectedForSynchronization);
-                    else
-                        assert (false);
-                    break;
 
-                default:
-                    assert (false);
-                    break;
-                }
-            }
-        }
-        //if data is not found:
-        return wxEmptyString;
-    }
-
-
-    virtual void SetValue( int row, int col, const wxString& value )
+    virtual void SetValue(int row, int col, const wxString& value)
     {
         assert (false); //should not be used, since values are retrieved directly from gridRefUI
     }
+
     virtual void Clear()
     {
         assert (false); // we don't want to use this, since the visible grid is directly connected to gridRefUI}
     }
-    virtual bool InsertRows( size_t pos = 0, size_t numRows = 1 )
+
+    virtual bool InsertRows(size_t pos = 0, size_t numRows = 1)
     {
         assert (false); // we don't want to use this, since the visible grid is directly connected to gridRefUI}
         return true;
     }
-    virtual bool AppendRows( size_t numRows = 1 )
+
+    virtual bool AppendRows(size_t numRows = 1)
     {
         assert (false); // we don't want to use this, since the visible grid is directly connected to gridRefUI}
         return true;
     }
-    virtual bool DeleteRows( size_t pos = 0, size_t numRows = 1 )
+
+    virtual bool DeleteRows(size_t pos = 0, size_t numRows = 1)
     {
         assert (false); // we don't want to use this, since the visible grid is directly connected to gridRefUI}
         return true;
@@ -216,7 +94,7 @@ public:
     {
         if (gridRefUI)
         {
-            int currentNrRows = GetNumberRows();
+            const int currentNrRows = GetNumberRows();
 
             if (lastNrRows < currentNrRows)
             {
@@ -243,79 +121,326 @@ public:
             }
             lastNrRows = currentNrRows;
         }
-    }
-//###########################################################################
 
-    enum RowColor {BLUE, GREY, NONE};
+        const int currentNrCols = GetNumberCols();
 
-    inline  //redundant command
-    RowColor getRowColor(int row) //rows that are filtered out are shown in different color
-    {
-        if (gridRefUI)
+        if (lastNrCols < currentNrCols)
         {
-            if (unsigned(row) < gridRefUI->size())
+            if (GetView())
             {
-                const FileCompareLine cmpLine = (*gridData)[(*gridRefUI)[row]];
-
-                //mark filtered rows
-                if (!cmpLine.selectedForSynchronization)
-                    return BLUE;
-                //mark directories
-                else if (gridIdentifier == 1 && cmpLine.fileDescrLeft.objType == FileDescrLine::TYPE_DIRECTORY)
-                    return GREY;
-                else if (gridIdentifier == 2 && cmpLine.fileDescrRight.objType == FileDescrLine::TYPE_DIRECTORY)
-                    return GREY;
-                else
-                    return NONE;
+                wxGridTableMessage msg(this,
+                                       wxGRIDTABLE_NOTIFY_COLS_APPENDED,
+                                       currentNrCols - lastNrCols);
+
+                GetView()->ProcessTableMessage( msg );
             }
         }
-        return NONE;
+        else if (lastNrCols > currentNrCols)
+        {
+            if (GetView())
+            {
+                wxGridTableMessage msg(this,
+                                       wxGRIDTABLE_NOTIFY_COLS_DELETED,
+                                       0,
+                                       lastNrCols - currentNrCols);
+
+                GetView()->ProcessTableMessage( msg );
+            }
+        }
+        lastNrCols = currentNrCols;
     }
+//###########################################################################
 
 
-    wxGridCellAttr* GetAttr(int row, int col, wxGridCellAttr::wxAttrKind  kind)
+    virtual wxString GetColLabelValue( int col )
     {
-        wxGridCellAttr* result = wxGridTableBase::GetAttr(row, col, kind);
+        return CustomGrid::getTypeName(getTypeAtPos(col));
+    }
+
+
+    virtual wxGridCellAttr* GetAttr(int row, int col, wxGridCellAttr::wxAttrKind  kind)
+    {
+        const wxColour& color = getRowColor(row);
 
-        //  MARK FILTERED ROWS:
+        //add color to some rows
+        wxGridCellAttr* result = wxGridTableBase::GetAttr(row, col, kind);
         if (result)
-        {   //if kind is not a cell or row attribute, we have to clone the cell attribute, since we don't want to change e.g. all column attribs
-            if (result->GetKind() != wxGridCellAttr::Cell && result->GetKind() != wxGridCellAttr::Row)
+        {
+            if (result->GetBackgroundColour() == color)
             {
-                wxGridCellAttr* attr = result->Clone();
+                return result;
+            }
+            else //grid attribute might be referenced by other nodes, so clone it!
+            {
+                wxGridCellAttr* attr = result->Clone(); //attr has ref-count 1
                 result->DecRef();
                 result = attr;
             }
-
-            RowColor color = getRowColor(row);
-            if (color == BLUE)
-                result->SetBackgroundColour(lightBlue);
-            else if (color == GREY)
-                result->SetBackgroundColour(lightGrey);
-            else
-                result->SetBackgroundColour(*wxWHITE);
         }
         else
-        {
-            result = new wxGridCellAttr;
+            result = new wxGridCellAttr; //created with ref-count 1
 
-            RowColor color = getRowColor(row);
-            if (color == BLUE)
-                result->SetBackgroundColour(lightBlue);
-            else if (color == GREY)
-                result->SetBackgroundColour(lightGrey);
-        }
+        result->SetBackgroundColour(color);
 
         return result;
     }
 
-private:
+
+    void setupColumns(const std::vector<xmlAccess::XmlGlobalSettings::ColumnTypes>& positions)
+    {
+        columnPositions = positions;
+        updateGridSizes(); //add or remove columns
+    }
+
+
+    XmlGlobalSettings::ColumnTypes getTypeAtPos(unsigned pos) const
+    {
+        if (pos < columnPositions.size())
+            return columnPositions[pos];
+        else
+            return XmlGlobalSettings::ColumnTypes(1000);
+    }
+
+
+protected:
+    virtual const wxColour& getRowColor(int row) = 0; //rows that are filtered out are shown in different color
+
+    std::vector<xmlAccess::XmlGlobalSettings::ColumnTypes> columnPositions;
+
     wxColour  lightBlue;
     wxColour  lightGrey;
-    int       gridIdentifier;
     GridView* gridRefUI; //(very fast) access to underlying grid data :)
     FileCompareResult* gridData;
     int       lastNrRows;
+    int       lastNrCols;
+};
+
+
+class CustomGridTableLeft : public CustomGridTable
+{
+public:
+    CustomGridTableLeft() : CustomGridTable() {}
+    ~CustomGridTableLeft() {}
+
+    virtual const wxColour& getRowColor(int row) //rows that are filtered out are shown in different color
+    {
+        if (gridRefUI && unsigned(row) < gridRefUI->size())
+        {
+            const FileCompareLine cmpLine = (*gridData)[(*gridRefUI)[row]];
+
+            //mark filtered rows
+            if (!cmpLine.selectedForSynchronization)
+                return lightBlue;
+            //mark directories
+            else if (cmpLine.fileDescrLeft.objType == FileDescrLine::TYPE_DIRECTORY)
+                return lightGrey;
+            else
+                return *wxWHITE;
+        }
+        return *wxWHITE;
+    }
+
+
+    //virtual impl.
+    wxString GetValue(int row, int col)
+    {
+        if (gridRefUI)
+        {
+            if (unsigned(row) < gridRefUI->size())
+            {
+                const FileCompareLine& gridLine = (*gridData)[(*gridRefUI)[row]];
+
+                if (gridLine.fileDescrLeft.objType == FileDescrLine::TYPE_DIRECTORY)
+                {
+                    switch (getTypeAtPos(col))
+                    {
+                    case XmlGlobalSettings::FILENAME: //filename
+                        return wxEmptyString;
+                    case XmlGlobalSettings::REL_PATH: //relative path
+                        return gridLine.fileDescrLeft.relativeName.c_str();
+                    case XmlGlobalSettings::SIZE: //file size
+                        return _("<Directory>");
+                    case XmlGlobalSettings::DATE: //date
+                        return wxEmptyString;
+                    }
+                }
+                else if (gridLine.fileDescrLeft.objType == FileDescrLine::TYPE_FILE)
+                {
+                    switch (getTypeAtPos(col))
+                    {
+                    case XmlGlobalSettings::FILENAME: //filename
+                        return gridLine.fileDescrLeft.relativeName.AfterLast(GlobalResources::FILE_NAME_SEPARATOR).c_str();
+                    case XmlGlobalSettings::REL_PATH: //relative path
+                        return gridLine.fileDescrLeft.relativeName.BeforeLast(GlobalResources::FILE_NAME_SEPARATOR).c_str();
+                    case XmlGlobalSettings::SIZE: //file size
+                    {
+                        wxString fileSize = gridLine.fileDescrLeft.fileSize.ToString(); //tmp string
+                        return globalFunctions::includeNumberSeparator(fileSize);
+                    }
+                    case XmlGlobalSettings::DATE: //date
+                        return FreeFileSync::utcTimeToLocalString(gridLine.fileDescrLeft.lastWriteTimeRaw);
+                    }
+                }
+            }
+        }
+        //if data is not found:
+        return wxEmptyString;
+    }
+};
+
+
+class CustomGridTableMiddle : public CustomGridTable
+{
+public:
+    CustomGridTableMiddle() : CustomGridTable()
+    {
+        lastNrCols = 1; //ensure CustomGridTable::updateGridSizes() is working correctly
+    }
+    ~CustomGridTableMiddle() {}
+
+    //virtual impl.
+    int GetNumberCols()
+    {
+        return 1;
+    }
+
+
+    int selectedForSynchronization(const unsigned int row) // 0 == false, 1 == true, -1 == not defined
+    {
+        if (gridRefUI && row < gridRefUI->size())
+        {
+            const FileCompareLine cmpLine = (*gridData)[(*gridRefUI)[row]];
+
+            if (cmpLine.selectedForSynchronization)
+                return 1;
+            else
+                return 0;
+        }
+        return -1;
+    }
+
+
+    //virtual impl.
+    const wxColour& getRowColor(int row) //rows that are filtered out are shown in different color
+    {
+        if (gridRefUI && unsigned(row) < gridRefUI->size())
+        {
+            const FileCompareLine cmpLine = (*gridData)[(*gridRefUI)[row]];
+
+            //mark filtered rows
+            if (!cmpLine.selectedForSynchronization)
+                return lightBlue;
+            else
+                return *wxWHITE;
+        }
+        return *wxWHITE;
+    }
+
+    //virtual impl.
+    wxString GetValue(int row, int col)
+    {
+        if (gridRefUI)
+        {
+            if (unsigned(row) < gridRefUI->size())
+            {
+                const FileCompareLine& gridLine = (*gridData)[(*gridRefUI)[row]];
+
+                switch (gridLine.cmpResult)
+                {
+                case FILE_LEFT_SIDE_ONLY:
+                    return wxT("<|");
+                case FILE_RIGHT_SIDE_ONLY:
+                    return wxT("|>");
+                case FILE_RIGHT_NEWER:
+                    return wxT(">>");
+                case FILE_LEFT_NEWER:
+                    return wxT("<<");
+                case FILE_DIFFERENT:
+                    return wxT("!=");
+                case FILE_EQUAL:
+                    return wxT("==");
+                default:
+                    assert (false);
+                    return wxEmptyString;
+                }
+            }
+        }
+        //if data is not found:
+        return wxEmptyString;
+    }
+};
+
+
+class CustomGridTableRight : public CustomGridTable
+{
+public:
+    CustomGridTableRight() : CustomGridTable() {}
+    ~CustomGridTableRight() {}
+
+    //virtual impl.
+    const wxColour& getRowColor(int row) //rows that are filtered out are shown in different color
+    {
+        if (gridRefUI && unsigned(row) < gridRefUI->size())
+        {
+            const FileCompareLine cmpLine = (*gridData)[(*gridRefUI)[row]];
+
+            //mark filtered rows
+            if (!cmpLine.selectedForSynchronization)
+                return lightBlue;
+            //mark directories
+            else if (cmpLine.fileDescrRight.objType == FileDescrLine::TYPE_DIRECTORY)
+                return lightGrey;
+            else
+                return *wxWHITE;
+        }
+        return *wxWHITE;
+    }
+
+    //virtual impl.
+    wxString GetValue(int row, int col)
+    {
+        if (gridRefUI)
+        {
+            if (unsigned(row) < gridRefUI->size())
+            {
+                const FileCompareLine& gridLine = (*gridData)[(*gridRefUI)[row]];
+
+                if (gridLine.fileDescrRight.objType == FileDescrLine::TYPE_DIRECTORY)
+                {
+                    switch (getTypeAtPos(col))
+                    {
+                    case XmlGlobalSettings::FILENAME: //filename
+                        return wxEmptyString;
+                    case XmlGlobalSettings::REL_PATH: //relative path
+                        return gridLine.fileDescrRight.relativeName.c_str();
+                    case XmlGlobalSettings::SIZE: //file size
+                        return _("<Directory>");
+                    case XmlGlobalSettings::DATE: //date
+                        return wxEmptyString;
+                    }
+                }
+                else if (gridLine.fileDescrRight.objType == FileDescrLine::TYPE_FILE)
+                {
+                    switch (getTypeAtPos(col))
+                    {
+                    case XmlGlobalSettings::FILENAME: //filename
+                        return gridLine.fileDescrRight.relativeName.AfterLast(GlobalResources::FILE_NAME_SEPARATOR).c_str();
+                    case XmlGlobalSettings::REL_PATH: //relative path
+                        return gridLine.fileDescrRight.relativeName.BeforeLast(GlobalResources::FILE_NAME_SEPARATOR).c_str();
+                    case XmlGlobalSettings::SIZE: //file size
+                    {
+                        wxString fileSize = gridLine.fileDescrRight.fileSize.ToString(); //tmp string
+                        return globalFunctions::includeNumberSeparator(fileSize);
+                    }
+                    case XmlGlobalSettings::DATE: //date
+                        return FreeFileSync::utcTimeToLocalString(gridLine.fileDescrRight.lastWriteTimeRaw);
+                    }
+                }
+            }
+        }
+        //if data is not found:
+        return wxEmptyString;
+    }
 };
 
 
@@ -333,26 +458,33 @@ CustomGrid::CustomGrid(wxWindow *parent,
         m_gridLeft(NULL), m_gridRight(NULL), m_gridMiddle(NULL),
         gridDataTable(NULL),
         currentSortColumn(-1),
-        sortMarker(NULL) {}
-
-
-CustomGrid::~CustomGrid() {}
-
-
-bool CustomGrid::CreateGrid(int numRows, int numCols, wxGrid::wxGridSelectionModes selmode)
+        sortMarker(NULL)
 {
-    //use custom wxGridTableBase class for management of large sets of formatted data.
-    //This is done in CreateGrid instead of SetTable method since source code is generated and wxFormbuilder invokes CreatedGrid by default.
-
-    gridDataTable = new CustomGridTableBase(numRows, numCols);
-    SetTable(gridDataTable, true, selmode);  //give ownership to wxGrid: gridDataTable is deleted automatically in wxGrid destructor
-    return true;
+    //set color of selections
+    wxColour darkBlue(40, 35, 140);
+    SetSelectionBackground(darkBlue);
+    SetSelectionForeground(*wxWHITE);
 }
 
 
-void CustomGrid::deactivateScrollbars()
+void CustomGrid::initSettings(bool enableScrollbars,
+                              CustomGrid* gridLeft,
+                              CustomGrid* gridRight,
+                              CustomGrid* gridMiddle,
+                              GridView* gridRefUI,
+                              FileCompareResult* gridData)
 {
-    scrollbarsEnabled = false;
+    scrollbarsEnabled = enableScrollbars;
+
+    //these grids will scroll together
+    assert(gridLeft && gridRight && gridMiddle);
+    m_gridLeft   = gridLeft;
+    m_gridRight  = gridRight;
+    m_gridMiddle = gridMiddle;
+
+    //set underlying grid data
+    assert(gridDataTable);
+    gridDataTable->setGridDataTable(gridRefUI, gridData);
 }
 
 
@@ -380,7 +512,7 @@ void CustomGrid::adjustGridHeights() //m_gridLeft, m_gridRight, m_gridMiddle are
 
     if (y1 != y2 || y2 != y3)
     {
-        int yMax = max(y1, max(y2, y3));
+        int yMax = std::max(y1, std::max(y2, y3));
 
         if (::leadGrid == m_gridLeft)  //do not handle case (y1 == yMax) here!!! Avoid back coupling!
             m_gridLeft->SetMargins(0, 0);
@@ -404,90 +536,311 @@ void CustomGrid::adjustGridHeights() //m_gridLeft, m_gridRight, m_gridMiddle are
 }
 
 
-//this method is called when grid view changes: useful for parallel updating of multiple grids
-void CustomGrid::DoPrepareDC(wxDC& dc)
+void CustomGrid::updateGridSizes()
 {
-    wxScrollHelper::DoPrepareDC(dc);
+    assert(gridDataTable);
+    gridDataTable->updateGridSizes();
+}
 
-    int x, y = 0;
-    if (this == ::leadGrid)  //avoid back coupling
-    {
-        if (this == m_gridLeft)
+
+void CustomGrid::setSortMarker(const int sortColumn, const wxBitmap* bitmap)
+{
+    currentSortColumn = sortColumn;
+    sortMarker        = bitmap;
+}
+
+
+void CustomGrid::DrawColLabel(wxDC& dc, int col)
+{
+    wxGrid::DrawColLabel(dc, col);
+
+    if (col == currentSortColumn)
+        dc.DrawBitmap(*sortMarker, GetColRight(col) - 16 - 2, 2, true); //respect 2-pixel border
+}
+
+
+void CustomGrid::setColumnAttributes(const xmlAccess::XmlGlobalSettings::ColumnAttributes& attr)
+{
+    //remove special alignment for column "size"
+    for (int i = 0; i < GetNumberCols(); ++i)
+        if (getTypeAtPos(i) == XmlGlobalSettings::SIZE)
         {
-            GetViewStart(&x, &y);
-            m_gridRight->Scroll(x, y);
-            m_gridMiddle->Scroll(-1, y); //scroll in y-direction only
-            adjustGridHeights(); //keep here to ensure m_gridLeft, m_gridRight, m_gridMiddle != NULL
+            wxGridCellAttr* cellAttributes = GetOrCreateCellAttr(0, i);
+            cellAttributes->SetAlignment(wxALIGN_LEFT,wxALIGN_CENTRE);
+            SetColAttr(i, cellAttributes);
+            break;
         }
-        else if (this == m_gridRight)
+//----------------------------------------------------------------------------------
+    setSortMarker(-1); //clear sorting marker
+
+    columnSettings.clear();
+    if (attr.size() == 0)
+    {   //default settings:
+        xmlAccess::XmlGlobalSettings::ColumnAttrib newEntry;
+        newEntry.type     = xmlAccess::XmlGlobalSettings::FILENAME;
+        newEntry.visible  = true;
+        newEntry.position = 0;
+        newEntry.width    = 138;
+        columnSettings.push_back(newEntry);
+
+        newEntry.type     = xmlAccess::XmlGlobalSettings::REL_PATH;
+        newEntry.position = 1;
+        newEntry.width    = 118;
+        columnSettings.push_back(newEntry);
+
+        newEntry.type     = xmlAccess::XmlGlobalSettings::SIZE;
+        newEntry.position = 2;
+        newEntry.width    = 67;
+        columnSettings.push_back(newEntry);
+
+        newEntry.type     = xmlAccess::XmlGlobalSettings::DATE;
+        newEntry.position = 3;
+        newEntry.width    = 113;
+        columnSettings.push_back(newEntry);
+    }
+    else
+    {
+        for (unsigned int i = 0; i < COLUMN_TYPE_COUNT; ++i)
         {
-            GetViewStart(&x, &y);
-            m_gridLeft->Scroll(x, y);
-            m_gridMiddle->Scroll(-1, y);
-            adjustGridHeights(); //keep here to ensure m_gridLeft, m_gridRight, m_gridMiddle != NULL
+            XmlGlobalSettings::ColumnAttrib newEntry;
+
+            if (i < attr.size())
+                newEntry = attr[i];
+            else
+            {
+                newEntry.type     = xmlAccess::XmlGlobalSettings::FILENAME;
+                newEntry.visible  = true;
+                newEntry.position = i;
+                newEntry.width    = 100;
+            }
+            columnSettings.push_back(newEntry);
         }
-        else if (this == m_gridMiddle)
+
+        sort(columnSettings.begin(), columnSettings.end(), xmlAccess::sortByType);
+        for (unsigned int i = 0; i < COLUMN_TYPE_COUNT; ++i) //just be sure that each type exists only once
+            columnSettings[i].type = XmlGlobalSettings::ColumnTypes(i);
+
+        sort(columnSettings.begin(), columnSettings.end(), xmlAccess::sortByPositionOnly);
+        for (unsigned int i = 0; i < COLUMN_TYPE_COUNT; ++i) //just be sure that positions are numbered correctly
+            columnSettings[i].position = i;
+
+        sort(columnSettings.begin(), columnSettings.end(), xmlAccess::sortByPositionAndVisibility);
+    }
+
+    std::vector<XmlGlobalSettings::ColumnTypes> newPositions;
+    for (unsigned int i = 0; i < columnSettings.size() && columnSettings[i].visible; ++i)  //hidden columns are sorted to the end of vector!
+        newPositions.push_back(columnSettings[i].type);
+
+    //set column positions
+    assert(gridDataTable);
+    gridDataTable->setupColumns(newPositions);
+
+    //set column width (set them after setupColumns!)
+    for (unsigned int i = 0; i < newPositions.size(); ++i)
+        SetColSize(i, columnSettings[i].width);
+
+//--------------------------------------------------------------------------------------------------------
+    //set special alignment for column "size"
+    for (int i = 0; i < GetNumberCols(); ++i)
+        if (getTypeAtPos(i) == XmlGlobalSettings::SIZE)
         {
-            GetViewStart(&x, &y);
-            m_gridLeft->Scroll(-1, y);
-            m_gridRight->Scroll(-1, y);
-            adjustGridHeights(); //keep here to ensure m_gridLeft, m_gridRight, m_gridMiddle != NULL
+            wxGridCellAttr* cellAttributes = GetOrCreateCellAttr(0, i);
+            cellAttributes->SetAlignment(wxALIGN_RIGHT,wxALIGN_CENTRE);
+            SetColAttr(i, cellAttributes); //make filesize right justified on grids
+            break;
         }
-    }
+
+    ClearSelection();
+    ForceRefresh();
 }
 
 
-//these classes will scroll together, hence the name ;)
-void CustomGrid::setScrollFriends(CustomGrid* gridLeft, CustomGrid* gridRight, CustomGrid* gridMiddle)
+xmlAccess::XmlGlobalSettings::ColumnAttributes CustomGrid::getColumnAttributes()
 {
-    assert(gridLeft && gridRight && gridMiddle);
+    sort(columnSettings.begin(), columnSettings.end(), xmlAccess::sortByPositionAndVisibility);
 
-    m_gridLeft   = gridLeft;
-    m_gridRight  = gridRight;
-    m_gridMiddle = gridMiddle;
+    xmlAccess::XmlGlobalSettings::ColumnAttributes output;
+    xmlAccess::XmlGlobalSettings::ColumnAttrib newEntry;
+    for (unsigned int i = 0; i < columnSettings.size(); ++i)
+    {
+        newEntry = columnSettings[i];
+        if (newEntry.visible)  //hidden columns are sorted to the end of vector!
+            newEntry.width = GetColSize(i);
+        output.push_back(newEntry);
+    }
 
-    assert(gridDataTable);
-    if (this == m_gridLeft)
-        gridDataTable->SetGridIdentifier(1);
-    else if (this == m_gridRight)
-        gridDataTable->SetGridIdentifier(2);
-    else if (this == m_gridMiddle)
-        gridDataTable->SetGridIdentifier(3);
-    else
-        assert (false);
+    return output;
 }
 
 
-void CustomGrid::setGridDataTable(GridView* gridRefUI, FileCompareResult* gridData)
-{   //set underlying grid data
+XmlGlobalSettings::ColumnTypes CustomGrid::getTypeAtPos(unsigned pos) const
+{
     assert(gridDataTable);
-    gridDataTable->setGridDataTable(gridRefUI, gridData);
+    return gridDataTable->getTypeAtPos(pos);
 }
 
 
-void CustomGrid::updateGridSizes()
+wxString CustomGrid::getTypeName(XmlGlobalSettings::ColumnTypes colType)
 {
-    assert(gridDataTable);
-    gridDataTable->updateGridSizes();
+    switch (colType)
+    {
+    case XmlGlobalSettings::FILENAME:
+        return _("Filename");
+    case XmlGlobalSettings::REL_PATH:
+        return _("Relative path");
+    case XmlGlobalSettings::SIZE:
+        return _("Size");
+    case XmlGlobalSettings::DATE:
+        return _("Date");
+    default:
+        return wxEmptyString;
+    }
 }
 
+//############################################################################################
+//CustomGrid specializations
 
-void CustomGrid::setSortMarker(const int sortColumn, const wxBitmap* bitmap)
+CustomGridLeft::CustomGridLeft(wxWindow *parent,
+                               wxWindowID id,
+                               const wxPoint& pos,
+                               const wxSize& size,
+                               long style,
+                               const wxString& name) :
+        CustomGrid(parent, id, pos, size, style, name) {}
+
+
+bool CustomGridLeft::CreateGrid(int numRows, int numCols, wxGrid::wxGridSelectionModes selmode)
 {
-    currentSortColumn = sortColumn;
-    sortMarker        = bitmap;
+    //use custom wxGridTableBase class for management of large sets of formatted data.
+    //This is done in CreateGrid instead of SetTable method since source code is generated and wxFormbuilder invokes CreatedGrid by default.
+    gridDataTable = new CustomGridTableLeft();
+    SetTable(gridDataTable, true, wxGrid::wxGridSelectRows);  //give ownership to wxGrid: gridDataTable is deleted automatically in wxGrid destructor
+    return true;
 }
 
 
-void CustomGrid::DrawColLabel(wxDC& dc, int col)
+//this method is called when grid view changes: useful for parallel updating of multiple grids
+void CustomGridLeft::DoPrepareDC(wxDC& dc)
 {
-    assert(0 <= col && col < 4);
+    wxScrollHelper::DoPrepareDC(dc);
 
-    wxGrid::DrawColLabel(dc, col);
+    int x, y = 0;
+    if (this == ::leadGrid)  //avoid back coupling
+    {
+        GetViewStart(&x, &y);
+        m_gridMiddle->Scroll(-1, y); //scroll in y-direction only
+        m_gridRight->Scroll(x, y);
+        adjustGridHeights(); //keep here to ensure m_gridLeft, m_gridRight, m_gridMiddle != NULL
+    }
+}
 
-    if (col == currentSortColumn)
+
+//----------------------------------------------------------------------------------------
+CustomGridMiddle::CustomGridMiddle(wxWindow *parent,
+                                   wxWindowID id,
+                                   const wxPoint& pos,
+                                   const wxSize& size,
+                                   long style,
+                                   const wxString& name) :
+        CustomGrid(parent, id, pos, size, style, name) {}
+
+
+bool CustomGridMiddle::CreateGrid(int numRows, int numCols, wxGrid::wxGridSelectionModes selmode)
+{
+    CustomGridTableMiddle* newTable = new CustomGridTableMiddle();
+    gridDataTable = newTable;
+    SetTable(gridDataTable, true, wxGrid::wxGridSelectRows);  //give ownership to wxGrid: gridDataTable is deleted automatically in wxGrid destructor
+
+    //display checkboxes (representing bool values) if row is enabled for synchronization
+    SetDefaultRenderer(new GridCellRendererAddCheckbox(newTable)); //SetDefaultRenderer takes ownership!
+
+    return true;
+}
+
+
+//this method is called when grid view changes: useful for parallel updating of multiple grids
+void CustomGridMiddle::DoPrepareDC(wxDC& dc)
+{
+    wxScrollHelper::DoPrepareDC(dc);
+
+    int x, y = 0;
+    if (this == ::leadGrid)  //avoid back coupling
     {
-        dc.DrawBitmap(*sortMarker, GetColRight(col) - 16 - 2, 2, true); //respect 2-pixel border
+        GetViewStart(&x, &y);
+        m_gridLeft->Scroll(-1, y);
+        m_gridRight->Scroll(-1, y);
+        adjustGridHeights(); //keep here to ensure m_gridLeft, m_gridRight, m_gridMiddle != NULL
     }
 }
 
+
+void CustomGridMiddle::GridCellRendererAddCheckbox::Draw(wxGrid& grid,
+        wxGridCellAttr& attr,
+        wxDC& dc,
+        const wxRect& rect,
+        int row, int col,
+        bool isSelected)
+{
+    const int selected = m_gridDataTable->selectedForSynchronization(row);
+    if (selected < 0) //no valid row
+    {
+        wxGridCellStringRenderer::Draw(grid, attr, dc, rect, row, col, isSelected);
+        return;
+    }
+
+    const int shift = std::min(11 + 3, rect.GetWidth()); //11 is width of checkbox image
+
+    wxRect rectShrinked(rect);
+
+    //clean first block of rect that will receive image of checkbox
+    rectShrinked.SetWidth(shift);
+    dc.SetPen(*wxWHITE_PEN);
+    dc.SetBrush(*wxWHITE_BRUSH);
+    dc.DrawRectangle(rectShrinked);
+
+    //print image into first block
+    rectShrinked.SetX(1);
+    if (selected > 0)
+        dc.DrawLabel(wxEmptyString, *globalResource.bitmapCheckBoxTrue, rectShrinked, wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL);
+    else //if (selected == 0) -> redundant
+        dc.DrawLabel(wxEmptyString, *globalResource.bitmapCheckBoxFalse, rectShrinked, wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL);
+
+    //print second block (default): display compare result
+    rectShrinked.SetWidth(rect.GetWidth() - shift);
+    rectShrinked.SetX(shift);
+    wxGridCellStringRenderer::Draw(grid, attr, dc, rectShrinked, row, col, isSelected);
+}
+
+
+//----------------------------------------------------------------------------------------
+CustomGridRight::CustomGridRight(wxWindow *parent,
+                                 wxWindowID id,
+                                 const wxPoint& pos,
+                                 const wxSize& size,
+                                 long style,
+                                 const wxString& name) :
+        CustomGrid(parent, id, pos, size, style, name) {}
+
+
+bool CustomGridRight::CreateGrid(int numRows, int numCols, wxGrid::wxGridSelectionModes selmode)
+{
+    gridDataTable = new CustomGridTableRight();
+    SetTable(gridDataTable, true, wxGrid::wxGridSelectRows);  //give ownership to wxGrid: gridDataTable is deleted automatically in wxGrid destructor
+    return true;
+}
+
+
+//this method is called when grid view changes: useful for parallel updating of multiple grids
+void CustomGridRight::DoPrepareDC(wxDC& dc)
+{
+    wxScrollHelper::DoPrepareDC(dc);
+
+    int x, y = 0;
+    if (this == ::leadGrid)  //avoid back coupling
+    {
+        GetViewStart(&x, &y);
+        m_gridLeft->Scroll(x, y);
+        m_gridMiddle->Scroll(-1, y);
+        adjustGridHeights(); //keep here to ensure m_gridLeft, m_gridRight, m_gridMiddle != NULL
+    }
+}
diff --git a/library/CustomGrid.h b/library/CustomGrid.h
index bd2f3fa8..97642159 100644
--- a/library/CustomGrid.h
+++ b/library/CustomGrid.h
@@ -4,12 +4,13 @@
 #include <vector>
 #include <wx/grid.h>
 #include "../FreeFileSync.h"
+#include "processXml.h"
 
 using namespace FreeFileSync;
 
 
-class CustomGridTableBase;
-
+class CustomGridTable;
+class CustomGridTableMiddle;
 //##################################################################################
 
 extern const wxGrid* leadGrid; //this global variable is not very nice...
@@ -24,35 +25,128 @@ public:
                long style           = wxWANTS_CHARS,
                const wxString& name = wxGridNameStr);
 
-    ~CustomGrid();
+    virtual ~CustomGrid() {}
 
-    virtual bool CreateGrid(int numRows, int numCols, wxGrid::wxGridSelectionModes selmode = wxGrid::wxGridSelectCells);
     //overwrite virtual method to finally get rid of the scrollbars
     virtual void SetScrollbar(int orientation, int position, int thumbSize, int range, bool refresh = true);
-    //this method is called when grid view changes: useful for parallel updating of multiple grids
-    virtual void DoPrepareDC(wxDC& dc);
+
     virtual void DrawColLabel(wxDC& dc, int col);
 
-    void deactivateScrollbars();
-    void setScrollFriends(CustomGrid* gridLeft, CustomGrid* gridRight, CustomGrid* gridMiddle);
-    void setGridDataTable(GridView* gridRefUI, FileCompareResult* gridData);
+    void initSettings(bool enableScrollbars,
+                      CustomGrid* gridLeft,
+                      CustomGrid* gridRight,
+                      CustomGrid* gridMiddle,
+                      GridView* gridRefUI,
+                      FileCompareResult* gridData);
+
+    //notify wxGrid that underlying table size has changed
     void updateGridSizes();
+
     //set sort direction indicator on UI
     void setSortMarker(const int sortColumn, const wxBitmap* bitmap = &wxNullBitmap);
 
-private:
+    //set visibility, position and width of columns
+    void setColumnAttributes(const xmlAccess::XmlGlobalSettings::ColumnAttributes& attr);
+    xmlAccess::XmlGlobalSettings::ColumnAttributes getColumnAttributes();
+
+    xmlAccess::XmlGlobalSettings::ColumnTypes getTypeAtPos(unsigned pos) const;
+
+    static wxString getTypeName(xmlAccess::XmlGlobalSettings::ColumnTypes colType);
+
+    static const unsigned COLUMN_TYPE_COUNT = 4;
+
+protected:
+    //set visibility, position and width of columns
+    xmlAccess::XmlGlobalSettings::ColumnAttributes columnSettings;
+
+
     void adjustGridHeights();
 
     bool scrollbarsEnabled;
-
     CustomGrid* m_gridLeft;
     CustomGrid* m_gridRight;
     CustomGrid* m_gridMiddle;
 
-    CustomGridTableBase* gridDataTable;
+    CustomGridTable* gridDataTable;
 
     int currentSortColumn;
     const wxBitmap* sortMarker;
 };
 
+
+class CustomGridLeft : public CustomGrid
+{
+public:
+    CustomGridLeft(wxWindow *parent,
+                   wxWindowID id,
+                   const wxPoint& pos   = wxDefaultPosition,
+                   const wxSize& size   = wxDefaultSize,
+                   long style           = wxWANTS_CHARS,
+                   const wxString& name = wxGridNameStr);
+
+    ~CustomGridLeft() {}
+
+    //this method is called when grid view changes: useful for parallel updating of multiple grids
+    virtual void DoPrepareDC(wxDC& dc);
+
+    virtual bool CreateGrid(int numRows, int numCols, wxGrid::wxGridSelectionModes selmode = wxGrid::wxGridSelectCells);
+};
+
+
+class CustomGridMiddle : public CustomGrid
+{
+public:
+    CustomGridMiddle(wxWindow *parent,
+                     wxWindowID id,
+                     const wxPoint& pos   = wxDefaultPosition,
+                     const wxSize& size   = wxDefaultSize,
+                     long style           = wxWANTS_CHARS,
+                     const wxString& name = wxGridNameStr);
+
+    ~CustomGridMiddle() {}
+
+    //this method is called when grid view changes: useful for parallel updating of multiple grids
+    virtual void DoPrepareDC(wxDC& dc);
+
+    virtual bool CreateGrid(int numRows, int numCols, wxGrid::wxGridSelectionModes selmode = wxGrid::wxGridSelectCells);
+
+private:
+
+    class GridCellRendererAddCheckbox : public wxGridCellStringRenderer
+    {
+    public:
+        GridCellRendererAddCheckbox(CustomGridTableMiddle* gridDataTable) : m_gridDataTable(gridDataTable) {};
+
+
+        virtual void Draw(wxGrid& grid,
+                          wxGridCellAttr& attr,
+                          wxDC& dc,
+                          const wxRect& rect,
+                          int row, int col,
+                          bool isSelected);
+
+    private:
+        CustomGridTableMiddle* m_gridDataTable;
+    };
+};
+
+
+class CustomGridRight : public CustomGrid
+{
+public:
+    CustomGridRight(wxWindow *parent,
+                    wxWindowID id,
+                    const wxPoint& pos   = wxDefaultPosition,
+                    const wxSize& size   = wxDefaultSize,
+                    long style           = wxWANTS_CHARS,
+                    const wxString& name = wxGridNameStr);
+
+    ~CustomGridRight() {}
+
+    //this method is called when grid view changes: useful for parallel updating of multiple grids
+    virtual void DoPrepareDC(wxDC& dc);
+
+    virtual bool CreateGrid(int numRows, int numCols, wxGrid::wxGridSelectionModes selmode = wxGrid::wxGridSelectCells);
+};
+
 #endif // CUSTOMGRID_H_INCLUDED
diff --git a/library/customButton.cpp b/library/customButton.cpp
new file mode 100644
index 00000000..5cfa8a5a
--- /dev/null
+++ b/library/customButton.cpp
@@ -0,0 +1,293 @@
+#include "customButton.h"
+#include <wx/dcmemory.h>
+#include <wx/image.h>
+
+wxButtonWithImage::wxButtonWithImage(wxWindow *parent,
+                                     wxWindowID id,
+                                     const wxString& label,
+                                     const wxPoint& pos,
+                                     const wxSize& size,
+                                     long style,
+                                     const wxValidator& validator,
+                                     const wxString& name) :
+        wxBitmapButton(parent, id, wxNullBitmap, pos, size, style | wxBU_AUTODRAW, validator, name)
+{
+    setTextLabel(label);
+}
+
+
+void wxButtonWithImage::setBitmapFront(const wxBitmap& bitmap)
+{
+    bitmapFront = bitmap;
+    refreshButtonLabel();
+}
+
+
+void wxButtonWithImage::setTextLabel(const wxString& text)
+{
+    textLabel = text;
+    wxBitmapButton::SetLabel(text);
+    refreshButtonLabel();
+}
+
+
+void wxButtonWithImage::setBitmapBack(const wxBitmap& bitmap)
+{
+    bitmapBack = bitmap;
+    refreshButtonLabel();
+}
+
+
+void makeWhiteTransparent(const wxColor exceptColor, wxImage& image)
+{
+    unsigned char* alphaData = image.GetAlpha();
+    if (alphaData)
+    {
+        assert(exceptColor.Red() != 255);
+
+        unsigned char exCol = exceptColor.Red(); //alpha value can be extracted from any one of (red/green/blue)
+        unsigned char* imageStart = image.GetData();
+
+        unsigned char* j = alphaData;
+        const unsigned char* const rowEnd = j + image.GetWidth() * image.GetHeight();
+        while (j != rowEnd)
+        {
+            const unsigned char* imagePixel = imageStart + (j - alphaData) * 3; //each pixel consists of three chars
+            //exceptColor(red,green,blue) becomes fully opaque(255), while white(255,255,255) becomes transparent(0)
+            *(j++) = ((255 - imagePixel[0]) * wxIMAGE_ALPHA_OPAQUE) / (255 - exCol);
+        }
+    }
+}
+
+
+wxSize getSizeNeeded(const wxString& text, wxFont& font)
+{
+    wxCoord width, height;
+    wxMemoryDC dc;
+
+    wxString textFormatted = text;
+    textFormatted.Replace(wxT("&"), wxT(""), false); //remove accelerator
+    dc.GetMultiLineTextExtent(textFormatted, &width, &height , NULL, &font);
+    return wxSize(width, height);
+}
+
+/*
+inline
+void linearInterpolationHelper(const int shift, wxImage& img)
+{
+    unsigned char* const data = img.GetData();
+    const int width = img.GetWidth();
+    if (width < 2)
+        return;
+
+    const float intensity = 0.25;
+
+    for (int y = 1; y < img.GetHeight() - 1; ++y)
+    {
+        float back   = 0;
+        float middle = 0;
+        float front  = 0;
+
+        unsigned char* location           = data + 3 * (y * width) + shift;
+        const unsigned char* const endPos = location + 3 * width;
+
+        middle = (*location + *(location - 3 * width) + *(location + 3 * width)) / 3;;
+        front  = (*(location + 3) + *(location + 3 * (1 - width)) + *(location + 3 * (1 + width))) / 3;
+        *location += ((middle + front) / 2 - *location) * intensity;
+        location += 3;
+
+        while (location < endPos - 3)
+        {
+            back   = middle;
+            middle = front;
+            front  = (*(location + 3) + *(location + 3 * (1 - width)) + *(location + 3 * (1 + width))) / 3;
+            *location += ((back + middle + front) / 3 - *location) * intensity;
+            location += 3;
+        }
+
+        back   = middle;
+        middle = front;
+        *location += ((back + middle) / 2 - *location) * intensity;
+    }
+}
+
+
+void linearInterpolation(wxImage& img)
+{
+    linearInterpolationHelper(0, img); //red channel
+    linearInterpolationHelper(1, img); //green channel
+    linearInterpolationHelper(2, img); //blue channel
+}
+*/
+
+wxBitmap wxButtonWithImage::createBitmapFromText(const wxString& text)
+{
+    wxFont currentFont = wxBitmapButton::GetFont();
+    wxColor textColor  = wxBitmapButton::GetForegroundColour();
+
+    wxSize sizeNeeded = getSizeNeeded(text, currentFont);
+    wxBitmap newBitmap(sizeNeeded.GetWidth(), sizeNeeded.GetHeight());
+
+    wxMemoryDC dc;
+    dc.SelectObject(newBitmap);
+
+    //set up white background
+    dc.SetBackground(*wxWHITE_BRUSH);
+    dc.Clear();
+
+    //find position of accelerator
+    int indexAccel = -1;
+    size_t accelPos;
+    wxString textLabelFormatted = text;
+    if ((accelPos = text.find(wxT("&"))) != wxString::npos)
+    {
+        textLabelFormatted.Replace(wxT("&"), wxT(""), false); //remove accelerator
+        indexAccel = accelPos;
+    }
+
+    dc.SetTextForeground(textColor);
+    dc.SetTextBackground(*wxWHITE);
+    dc.SetFont(currentFont);
+    dc.DrawLabel(textLabelFormatted, wxNullBitmap, wxRect(0, 0, newBitmap.GetWidth(), newBitmap.GetHeight()), wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL, indexAccel);
+
+    dc.SelectObject(wxNullBitmap);
+
+    //add alpha channel to image
+    wxImage finalImage(newBitmap.ConvertToImage());
+    finalImage.SetAlpha();
+
+    //linearInterpolation(finalImage);
+
+    //make white background transparent
+    makeWhiteTransparent(textColor, finalImage);
+
+    return wxBitmap(finalImage);
+}
+
+
+//copy one image into another, allowing arbitrary overlapping! (pos may contain negative numbers)
+void writeToImage(const wxImage& source, const wxPoint pos, wxImage& target)
+{
+    //determine startpositions in source and target image, as well as width and height to be copied
+    wxPoint posSrc, posTrg;
+    int width, height;
+
+    //X-axis
+    if (pos.x < 0)
+    {
+        posSrc.x = -pos.x;
+        posTrg.x = 0;
+        width = std::min(pos.x + source.GetWidth(), target.GetWidth());
+    }
+    else
+    {
+        posSrc.x = 0;
+        posTrg.x = pos.x;
+        width = std::min(target.GetWidth() - pos.x, source.GetWidth());
+    }
+
+    //Y-axis
+    if (pos.y < 0)
+    {
+        posSrc.y = -pos.y;
+        posTrg.y = 0;
+        height = std::min(pos.y + source.GetHeight(), target.GetHeight());
+    }
+    else
+    {
+        posSrc.y = 0;
+        posTrg.y = pos.y;
+        height = std::min(target.GetHeight() - pos.y, source.GetHeight());
+    }
+
+
+    if (width > 0 && height > 0)
+    {
+        //copy source to target respecting overlapping parts
+        const unsigned char*       sourcePtr    = source.GetData() + 3 * (posSrc.x + posSrc.y * source.GetWidth());
+        const unsigned char* const sourcePtrEnd = source.GetData() + 3 * (posSrc.x + (posSrc.y + height) * source.GetWidth());
+        unsigned char*             targetPtr    = target.GetData() + 3 * (posTrg.x + posTrg.y * target.GetWidth());
+
+        while (sourcePtr < sourcePtrEnd)
+        {
+            memcpy(targetPtr, sourcePtr, 3 * width);
+            sourcePtr += 3 * source.GetWidth();
+            targetPtr += 3 * target.GetWidth();
+        }
+
+        //handle different cases concerning alpha channel
+        if (source.HasAlpha())
+        {
+            if (!target.HasAlpha())
+            {
+                target.SetAlpha();
+                unsigned char* alpha = target.GetAlpha();
+                memset(alpha, wxIMAGE_ALPHA_OPAQUE, target.GetWidth() * target.GetHeight());
+            }
+
+            //copy alpha channel
+            const unsigned char*       sourcePtr    = source.GetAlpha() + (posSrc.x + posSrc.y * source.GetWidth());
+            const unsigned char* const sourcePtrEnd = source.GetAlpha() + (posSrc.x + (posSrc.y + height) * source.GetWidth());
+            unsigned char*             targetPtr    = target.GetAlpha() + (posTrg.x + posTrg.y * target.GetWidth());
+
+            while (sourcePtr < sourcePtrEnd)
+            {
+                memcpy(targetPtr, sourcePtr, width);
+                sourcePtr += source.GetWidth();
+                targetPtr += target.GetWidth();
+            }
+        }
+        else if (target.HasAlpha())
+        {
+            unsigned char*             targetPtr    = target.GetAlpha() + (posTrg.x + posTrg.y * target.GetWidth());
+            const unsigned char* const targetPtrEnd = target.GetAlpha() + (posTrg.x + (posTrg.y + height) * target.GetWidth());
+
+            while (targetPtr < targetPtrEnd)
+            {
+                memset(targetPtr, wxIMAGE_ALPHA_OPAQUE, width);
+                targetPtr += target.GetWidth();
+            }
+        }
+    }
+}
+
+
+void wxButtonWithImage::refreshButtonLabel()
+{
+    wxBitmap bitmapText = createBitmapFromText(textLabel);
+
+    //calculate dimensions of new button
+    const int height = std::max(std::max(bitmapFront.GetHeight(), bitmapText.GetHeight()), bitmapBack.GetHeight());
+    const int width  = bitmapFront.GetWidth() + bitmapText.GetWidth() + bitmapBack.GetWidth();
+
+    //create a transparent image
+    wxImage transparentImage(width, height, false);
+    transparentImage.SetAlpha();
+    unsigned char* alpha = transparentImage.GetAlpha();
+    memset(alpha, wxIMAGE_ALPHA_TRANSPARENT, width * height);
+
+    //wxDC::DrawLabel() unfortunately isn't working for transparent images on Linux, so we need to use custom image-concatenation
+    if (bitmapFront.IsOk())
+        writeToImage(wxImage(bitmapFront.ConvertToImage()),
+                     wxPoint(0, (transparentImage.GetHeight() - bitmapFront.GetHeight()) / 2),
+                     transparentImage);
+
+    if (bitmapText.IsOk())
+        writeToImage(wxImage(bitmapText.ConvertToImage()),
+                     wxPoint(bitmapFront.GetWidth(), (transparentImage.GetHeight() - bitmapText.GetHeight()) / 2),
+                     transparentImage);
+
+    if (bitmapBack.IsOk())
+        writeToImage(wxImage(bitmapBack.ConvertToImage()),
+                     wxPoint(bitmapFront.GetWidth() + bitmapText.GetWidth(), (transparentImage.GetHeight() - bitmapBack.GetHeight()) / 2),
+                     transparentImage);
+
+    //adjust button size
+    wxSize minSize = GetMinSize();
+
+    //SetMinSize() instead of SetSize() is needed here for wxWindows layout determination to work corretly
+    wxBitmapButton::SetMinSize(wxSize(std::max(width + 10, minSize.GetWidth()), std::max(height + 5, minSize.GetHeight())));
+
+    //finally set bitmap
+    wxBitmapButton::SetBitmapLabel(wxBitmap(transparentImage));
+}
diff --git a/library/customButton.h b/library/customButton.h
new file mode 100644
index 00000000..1f3f50ec
--- /dev/null
+++ b/library/customButton.h
@@ -0,0 +1,40 @@
+/***************************************************************
+ * Purpose:   wxButton with bitmap label
+ * Author:    ZenJu (zhnmju123@gmx.de)
+ * Created:   Feb. 2009
+ **************************************************************/
+
+#ifndef CUSTOMBUTTON_H_INCLUDED
+#define CUSTOMBUTTON_H_INCLUDED
+
+#include <wx/bmpbuttn.h>
+
+
+//wxButtonWithImage behaves like wxButton but optionally adds bitmap labels
+class wxButtonWithImage : public wxBitmapButton
+{
+public:
+    wxButtonWithImage(wxWindow *parent,
+                      wxWindowID id,
+                      const wxString& label,
+                      const wxPoint& pos           = wxDefaultPosition,
+                      const wxSize& size           = wxDefaultSize,
+                      long style                   = 0,
+                      const wxValidator& validator = wxDefaultValidator,
+                      const wxString& name         = wxButtonNameStr);
+
+    void setBitmapFront(const wxBitmap& bitmap);
+    void setTextLabel(  const wxString& text);
+    void setBitmapBack( const wxBitmap& bitmap);
+
+private:
+    wxBitmap createBitmapFromText(const wxString& text);
+    void refreshButtonLabel();
+
+    wxBitmap bitmapFront;
+    wxString textLabel;
+    wxBitmap bitmapBack;
+};
+
+
+#endif // CUSTOMBUTTON_H_INCLUDED
diff --git a/library/fileHandling.cpp b/library/fileHandling.cpp
index eb14b2f6..688d3640 100644
--- a/library/fileHandling.cpp
+++ b/library/fileHandling.cpp
@@ -8,9 +8,9 @@
 #endif  // FFS_WIN
 
 inline
-bool endsWithPathSeparator(const wxChar* name)
+bool endsWithPathSeparator(const Zstring& name)
 {
-    size_t len = wxStrlen(name);
+    const size_t len = name.length();
     return len && (name[len - 1] == GlobalResources::FILE_NAME_SEPARATOR);
 }
 
@@ -84,12 +84,12 @@ bool moveToRecycleBin(const Zstring& filename) throw(RuntimeException)
 inline
 void FreeFileSync::removeFile(const Zstring& filename, const bool useRecycleBin)
 {
-    if (!wxFileExists(filename)) return; //this is NOT an error situation: the manual deletion relies on it!
+    if (!wxFileExists(filename.c_str())) return; //this is NOT an error situation: the manual deletion relies on it!
 
     if (useRecycleBin)
     {
         if (!moveToRecycleBin(filename))
-            throw FileError(wxString(_("Error moving to recycle bin:")) + wxT(" \"") + filename.c_str() + wxT("\""));
+            throw FileError(Zstring(_("Error moving to recycle bin:")) + wxT(" \"") + filename + wxT("\""));
         return;
     }
 
@@ -97,11 +97,11 @@ void FreeFileSync::removeFile(const Zstring& filename, const bool useRecycleBin)
     if (!SetFileAttributes(
                 filename.c_str(),     //address of filename
                 FILE_ATTRIBUTE_NORMAL //attributes to set
-            )) throw FileError(wxString(_("Error deleting file:")) + wxT(" \"") + filename.c_str() + wxT("\""));
+            )) throw FileError(Zstring(_("Error deleting file:")) + wxT(" \"") + filename + wxT("\""));
 #endif  //FFS_WIN
 
-    if (!wxRemoveFile(filename))
-        throw FileError(wxString(_("Error deleting file:")) + wxT(" \"") + filename.c_str() + wxT("\""));
+    if (!wxRemoveFile(filename.c_str()))
+        throw FileError(Zstring(_("Error deleting file:")) + wxT(" \"") + filename + wxT("\""));
 }
 
 
@@ -112,12 +112,12 @@ void FreeFileSync::removeDirectory(const Zstring& directory, const bool useRecyc
     if (useRecycleBin)
     {
         if (!moveToRecycleBin(directory))
-            throw FileError(wxString(_("Error moving to recycle bin:")) + wxT(" \"") + directory.c_str() + wxT("\""));
+            throw FileError(Zstring(_("Error moving to recycle bin:")) + wxT(" \"") + directory + wxT("\""));
         return;
     }
 
-    vector<Zstring> fileList;
-    vector<Zstring> dirList;
+    std::vector<Zstring> fileList;
+    std::vector<Zstring> dirList;
 
     try
     {   //should be executed in own scope so that directory access does not disturb deletion!
@@ -125,7 +125,7 @@ void FreeFileSync::removeDirectory(const Zstring& directory, const bool useRecyc
     }
     catch (const FileError& e)
     {
-        throw FileError(wxString(_("Error deleting directory:")) + wxT(" \"") + directory.c_str() + wxT("\""));
+        throw FileError(Zstring(_("Error deleting directory:")) + wxT(" \"") + directory + wxT("\""));
     }
 
     for (unsigned int j = 0; j < fileList.size(); ++j)
@@ -139,11 +139,11 @@ void FreeFileSync::removeDirectory(const Zstring& directory, const bool useRecyc
         if (!SetFileAttributes(
                     dirList[j].c_str(),     // address of directory name
                     FILE_ATTRIBUTE_NORMAL)) // attributes to set
-            throw FileError(wxString(_("Error deleting directory:")) + wxT(" \"") + dirList[j].c_str() + wxT("\""));
+            throw FileError(Zstring(_("Error deleting directory:")) + wxT(" \"") + dirList[j] + wxT("\""));
 #endif  // FFS_WIN
 
-        if (!wxRmdir(dirList[j]))
-            throw FileError(wxString(_("Error deleting directory:")) + wxT(" \"") + dirList[j].c_str() + wxT("\""));
+        if (!wxRmdir(dirList[j].c_str()))
+            throw FileError(Zstring(_("Error deleting directory:")) + wxT(" \"") + dirList[j] + wxT("\""));
     }
 }
 
@@ -157,12 +157,12 @@ void FreeFileSync::createDirectory(const Zstring& directory, const int level)
         return;
 
     //try to create directory
-    if (wxMkdir(directory))
+    if (wxMkdir(directory.c_str()))
         return;
 
     //if not successfull try to create parent folders first
     Zstring parentDir;
-    if (endsWithPathSeparator(directory.c_str())) //may be valid on first level of recursion at most! Usually never true!
+    if (endsWithPathSeparator(directory)) //may be valid on first level of recursion at most! Usually never true!
     {
         parentDir = directory.BeforeLast(GlobalResources::FILE_NAME_SEPARATOR);
         parentDir = parentDir.BeforeLast(GlobalResources::FILE_NAME_SEPARATOR);
@@ -176,10 +176,10 @@ void FreeFileSync::createDirectory(const Zstring& directory, const int level)
     createDirectory(parentDir, level + 1);
 
     //now creation should be possible
-    if (!wxMkdir(directory))
+    if (!wxMkdir(directory.c_str()))
     {
         if (level == 0)
-            throw FileError(wxString(_("Error creating directory:")) + wxT(" \"") + directory.c_str() + wxT("\""));
+            throw FileError(Zstring(_("Error creating directory:")) + wxT(" \"") + directory + wxT("\""));
     }
 }
 
@@ -189,12 +189,12 @@ void FreeFileSync::copyFolderAttributes(const Zstring& source, const Zstring& ta
 #ifdef FFS_WIN
     DWORD attr = GetFileAttributes(source.c_str()); // address of the name of a file or directory
     if (attr ==  0xFFFFFFFF)
-        throw FileError(wxString(_("Error reading file attributes:")) + wxT(" \"") + source.c_str() + wxT("\""));
+        throw FileError(Zstring(_("Error reading folder attributes:")) + wxT(" \"") + source + wxT("\""));
 
     if (!SetFileAttributes(
                 target.c_str(), // address of filename
                 attr))          // address of attributes to set
-        throw FileError(wxString(_("Error writing file attributes:")) + wxT(" \"") + target.c_str() + wxT("\""));
+        throw FileError(Zstring(_("Error writing folder attributes:")) + wxT(" \"") + target + wxT("\""));
 #elif defined FFS_LINUX
 //Linux doesn't use attributes for files or folders
 #endif
@@ -204,19 +204,19 @@ void FreeFileSync::copyFolderAttributes(const Zstring& source, const Zstring& ta
 class GetAllFilesSimple : public wxDirTraverser
 {
 public:
-    GetAllFilesSimple(vector<Zstring>& files, vector<Zstring>& subDirectories) :
+    GetAllFilesSimple(std::vector<Zstring>& files, std::vector<Zstring>& subDirectories) :
             m_files(files),
             m_dirs(subDirectories) {}
 
     wxDirTraverseResult OnDir(const wxString& dirname)
     {
-        m_dirs.push_back(dirname);
+        m_dirs.push_back(dirname.c_str());
         return wxDIR_CONTINUE;
     }
 
     wxDirTraverseResult OnFile(const wxString& filename)
     {
-        m_files.push_back(filename);
+        m_files.push_back(filename.c_str());
         return wxDIR_CONTINUE;
     }
 
@@ -227,22 +227,22 @@ public:
     }
 
 private:
-    vector<Zstring>& m_files;
-    vector<Zstring>& m_dirs;
+    std::vector<Zstring>& m_files;
+    std::vector<Zstring>& m_dirs;
 };
 
 
-void FreeFileSync::getAllFilesAndDirs(const Zstring& sourceDir, vector<Zstring>& files, vector<Zstring>& directories) throw(FileError)
+void FreeFileSync::getAllFilesAndDirs(const Zstring& sourceDir, std::vector<Zstring>& files, std::vector<Zstring>& directories) throw(FileError)
 {
     files.clear();
     directories.clear();
 
     //get all files and directories from current directory (and subdirectories)
-    wxDir dir(sourceDir);
+    wxDir dir(sourceDir.c_str());
     GetAllFilesSimple traverser(files, directories);
 
     if (dir.Traverse(traverser) == (size_t)-1)
-        throw FileError(wxString(_("Error traversing directory:")) + wxT(" \"") + sourceDir.c_str() + wxT("\""));
+        throw FileError(Zstring(_("Error traversing directory:")) + wxT(" \"") + sourceDir + wxT("\""));
 }
 
 
@@ -267,10 +267,10 @@ void getWin32FileInformation(const WIN32_FIND_DATA& input, FreeFileSync::FileInf
 {
     //convert UTC FILETIME to ANSI C format (number of seconds since Jan. 1st 1970 UTC)
     wxULongLong writeTimeLong(input.ftLastWriteTime.dwHighDateTime, input.ftLastWriteTime.dwLowDateTime);
-    writeTimeLong /= 10000000;    //reduce precision to 1 second (FILETIME has unit 10^-7 s)
-    writeTimeLong -= wxULongLong(2, 3054539008UL);   //timeshift between ansi C time and FILETIME in seconds == 11644473600s
-    output.lastWriteTimeRaw = writeTimeLong.GetLo(); //it should fit into a 32bit variable now
-    assert(writeTimeLong.GetHi() == 0);
+    writeTimeLong /= 10000000;                     //reduce precision to 1 second (FILETIME has unit 10^-7 s)
+    writeTimeLong -= wxULongLong(2, 3054539008UL); //timeshift between ansi C time and FILETIME in seconds == 11644473600s
+    assert(writeTimeLong.GetHi() == 0);            //it should fit into a 32bit variable now
+    output.lastWriteTimeRaw = writeTimeLong.GetLo();
 
     output.fileSize = wxULongLong(input.nFileSizeHigh, input.nFileSizeLow);
 }
@@ -281,7 +281,7 @@ class EnhancedFileTraverser : public wxDirTraverser
 public:
     EnhancedFileTraverser(FreeFileSync::FullDetailFileTraverser* sink) : m_sink(sink) {}
 
-    virtual wxDirTraverseResult OnFile(const wxString& filename)
+    wxDirTraverseResult OnFile(const wxString& filename) //virtual impl.
     {
         struct stat fileInfo;
         if (stat(filename.c_str(), &fileInfo) != 0)
@@ -291,17 +291,17 @@ public:
         details.lastWriteTimeRaw = fileInfo.st_mtime; //UTC time(ANSI C format); unit: 1 second
         details.fileSize         = fileInfo.st_size;
 
-        return m_sink->OnFile(filename, details);
+        return m_sink->OnFile(filename.c_str(), details);
     }
 
-    virtual wxDirTraverseResult OnDir(const wxString& dirname)
+    wxDirTraverseResult OnDir(const wxString& dirname) //virtual impl.
     {
-        return m_sink->OnDir(dirname);
+        return m_sink->OnDir(dirname.c_str());
     }
 
-    virtual wxDirTraverseResult OnOpenError(const wxString& errorText)
+    wxDirTraverseResult OnOpenError(const wxString& errorText) //virtual impl.
     {
-        return m_sink->OnError(errorText);
+        return m_sink->OnError(errorText.c_str());
     }
 
 private:
@@ -322,7 +322,7 @@ bool FreeFileSync::traverseInDetail(const Zstring& directory, FullDetailFileTrav
     }
 
     Zstring directoryFormatted = directory;
-    if (!endsWithPathSeparator(directoryFormatted.c_str()))
+    if (!endsWithPathSeparator(directoryFormatted))
         directoryFormatted += GlobalResources::FILE_NAME_SEPARATOR;
 
     const Zstring filespec = directoryFormatted + wxT("*.*");
@@ -403,10 +403,10 @@ bool FreeFileSync::traverseInDetail(const Zstring& directory, FullDetailFileTrav
 #elif defined FFS_LINUX
 
     //use standard file traverser and enrich output with additional file information
-    //could be improved with own traversing algorithm for optimized performance
+    //could be improved with custom traversing algorithm for optimized performance
     EnhancedFileTraverser traverser(sink);
 
-    wxDir dir(directory);
+    wxDir dir(directory.c_str());
     if (dir.IsOpened())
         dir.Traverse(traverser);
 
diff --git a/library/fileHandling.h b/library/fileHandling.h
index cd86333b..5578ce91 100644
--- a/library/fileHandling.h
+++ b/library/fileHandling.h
@@ -8,21 +8,21 @@
 class FileError //Exception class used to notify file/directory copy/delete errors
 {
 public:
-    FileError(const wxString& txt) : errorMessage(txt) {}
+    FileError(const Zstring& txt) : errorMessage(txt) {}
 
-    wxString show() const
+    Zstring show() const
     {
         return errorMessage;
     }
 
 private:
-    wxString errorMessage;
+    Zstring errorMessage;
 };
 
 
 namespace FreeFileSync
 {
-    void getAllFilesAndDirs(const Zstring& sourceDir, vector<Zstring>& files, vector<Zstring>& directories) throw(FileError);
+    void getAllFilesAndDirs(const Zstring& sourceDir, std::vector<Zstring>& files, std::vector<Zstring>& directories) throw(FileError);
 
     //recycler
     bool recycleBinExists(); //test existence of Recycle Bin API on current system
diff --git a/library/globalFunctions.cpp b/library/globalFunctions.cpp
index 7f8b57c0..eed6dfe9 100644
--- a/library/globalFunctions.cpp
+++ b/library/globalFunctions.cpp
@@ -11,27 +11,27 @@ int globalFunctions::round(const double d)
 }
 
 
-string globalFunctions::numberToString(const unsigned int number)
+std::string globalFunctions::numberToString(const unsigned int number)
 {
     char result[100];
     sprintf(result, "%u", number);
-    return string(result);
+    return std::string(result);
 }
 
 
-string globalFunctions::numberToString(const int number)
+std::string globalFunctions::numberToString(const int number)
 {
     char result[100];
     sprintf(result, "%d", number);
-    return string(result);
+    return std::string(result);
 }
 
 
-string globalFunctions::numberToString(const float number)
+std::string globalFunctions::numberToString(const float number)
 {
     char result[100];
     sprintf(result, "%f", number);
-    return string(result);
+    return std::string(result);
 }
 
 
@@ -53,14 +53,14 @@ wxString globalFunctions::numberToWxString(const float number)
 }
 
 
-int globalFunctions::stringToInt(const string& number)
+int globalFunctions::stringToInt(const std::string& number)
 {
     return atoi(number.c_str());
 }
 
 
 inline
-double globalFunctions::stringToDouble(const string& number)
+double globalFunctions::stringToDouble(const std::string& number)
 {
     return atof(number.c_str());
 }
@@ -96,7 +96,7 @@ wxString& globalFunctions::includeNumberSeparator(wxString& number)
 }
 
 
-int globalFunctions::readInt(ifstream& stream)
+int globalFunctions::readInt(std::ifstream& stream)
 {
     int result = 0;
     char* buffer = reinterpret_cast<char*>(&result);
@@ -105,7 +105,7 @@ int globalFunctions::readInt(ifstream& stream)
 }
 
 
-void globalFunctions::writeInt(ofstream& stream, const int number)
+void globalFunctions::writeInt(std::ofstream& stream, const int number)
 {
     const char* buffer = reinterpret_cast<const char*>(&number);
     stream.write(buffer, sizeof(int));
diff --git a/library/globalFunctions.h b/library/globalFunctions.h
index f46a5906..b4ccba5c 100644
--- a/library/globalFunctions.h
+++ b/library/globalFunctions.h
@@ -10,8 +10,6 @@
 #include <wx/stream.h>
 #include <wx/stopwatch.h>
 
-using namespace std;
-
 
 namespace globalFunctions
 {
@@ -23,24 +21,24 @@ namespace globalFunctions
         return(d<0?-d:d);
     }
 
-    string numberToString(const unsigned int number); //convert number to string
-    string numberToString(const int number);          //convert number to string
-    string numberToString(const float number);        //convert number to string
+    std::string numberToString(const unsigned int number); //convert number to string
+    std::string numberToString(const int number);          //convert number to string
+    std::string numberToString(const float number);        //convert number to string
 
     wxString numberToWxString(const unsigned int number); //convert number to wxString
     wxString numberToWxString(const int number);          //convert number to wxString
     wxString numberToWxString(const float number);        //convert number to wxString
 
-    int    stringToInt(   const string& number); //convert String to number
-    double stringToDouble(const string& number); //convert String to number
+    int    stringToInt(   const std::string& number); //convert String to number
+    double stringToDouble(const std::string& number); //convert String to number
 
     int    wxStringToInt(   const wxString& number); //convert wxString to number
     double wxStringToDouble(const wxString& number); //convert wxString to number
 
     wxString& includeNumberSeparator(wxString& number);
 
-    int readInt(ifstream& stream);  //read int from file stream
-    void writeInt(ofstream& stream, const int number);  //write int to filestream
+    int readInt(std::ifstream& stream);  //read int from file stream
+    void writeInt(std::ofstream& stream, const int number);  //write int to filestream
 
     int readInt(wxInputStream& stream);  //read int from file stream
     void writeInt(wxOutputStream& stream, const int number);  //write int to filestream
@@ -108,12 +106,12 @@ private:
 //Note: the following lines are a performance optimization for deleting elements from a vector. It is incredibly faster to create a new
 //vector and leave specific elements out than to delete row by row and force recopying of most elements for each single deletion (linear vs quadratic runtime)
 template <class T>
-void removeRowsFromVector(vector<T>& grid, const set<int>& rowsToRemove)
+void removeRowsFromVector(std::vector<T>& grid, const std::set<int>& rowsToRemove)
 {
-    vector<T> temp;
+    std::vector<T> temp;
     int rowToSkip = -1; //keep it an INT!
 
-    set<int>::iterator rowToSkipIndex = rowsToRemove.begin();
+    std::set<int>::iterator rowToSkipIndex = rowsToRemove.begin();
 
     if (rowToSkipIndex != rowsToRemove.end())
         rowToSkip = *rowToSkipIndex;
diff --git a/library/misc.cpp b/library/misc.cpp
index 050be108..f5c562c7 100644
--- a/library/misc.cpp
+++ b/library/misc.cpp
@@ -19,8 +19,7 @@ void exchangeEscapeChars(wxString& data)
         {
             //read next character
             ++input;
-            value = *input;
-            if (value == wxChar(0))
+            if ((value = *input) == wxChar(0))
                 break;
 
             switch (value)
@@ -60,23 +59,32 @@ void CustomLocale::setLanguage(const int language)
 {
     currentLanguage = language;
 
-    string languageFile;
+    std::string languageFile;
     switch (language)
     {
-    case wxLANGUAGE_GERMAN:
-        languageFile = "german.lng";
+    case wxLANGUAGE_CHINESE_SIMPLIFIED:
+        languageFile = "Languages/chinese_simple.lng";
+        break;
+    case wxLANGUAGE_DUTCH:
+        languageFile = "Languages/dutch.lng";
         break;
     case wxLANGUAGE_FRENCH:
-        languageFile = "french.lng";
+        languageFile = "Languages/french.lng";
+        break;
+    case wxLANGUAGE_GERMAN:
+        languageFile = "Languages/german.lng";
+        break;
+    case wxLANGUAGE_ITALIAN:
+        languageFile = "Languages/italian.lng";
         break;
     case wxLANGUAGE_JAPANESE:
-        languageFile = "japanese.lng";
+        languageFile = "Languages/japanese.lng";
         break;
-    case wxLANGUAGE_DUTCH:
-        languageFile = "dutch.lng";
+    case wxLANGUAGE_POLISH:
+        languageFile = "Languages/polish.lng";
         break;
-    case wxLANGUAGE_CHINESE_SIMPLIFIED:
-        languageFile = "chinese_simple.lng";
+    case wxLANGUAGE_PORTUGUESE:
+        languageFile = "Languages/portuguese.lng";
         break;
     default:
         languageFile.clear();
@@ -96,7 +104,7 @@ void CustomLocale::setLanguage(const int language)
     char temp[bufferSize];
     if (!languageFile.empty())
     {
-        ifstream langFile(languageFile.c_str(), ios::binary);
+        std::ifstream langFile(languageFile.c_str(), std::ios::binary);
         if (langFile)
         {
             TranslationLine currentLine;
diff --git a/library/misc.h b/library/misc.h
index 5fa2c943..c3e960ff 100644
--- a/library/misc.h
+++ b/library/misc.h
@@ -6,7 +6,6 @@
 #include <wx/intl.h>
 #include <wx/panel.h>
 
-using namespace std;
 
 struct TranslationLine
 {
@@ -26,7 +25,7 @@ struct TranslationLine
         return (original == b.original);
     }
 };
-typedef set<TranslationLine> Translation;
+typedef std::set<TranslationLine> Translation;
 
 
 class CustomLocale : public wxLocale
@@ -44,7 +43,7 @@ public:
 
     const wxChar* GetString(const wxChar* szOrigString, const wxChar* szDomain = NULL) const;
 
-    static const string FfsLanguageDat;
+    static const std::string FfsLanguageDat;
 
 private:
     Translation translationDB;
diff --git a/library/multithreading.cpp b/library/multithreading.cpp
index bf5918d2..f7f5ed04 100644
--- a/library/multithreading.cpp
+++ b/library/multithreading.cpp
@@ -39,6 +39,7 @@ class WorkerThread : public wxThread
 
 public:
     WorkerThread(UpdateWhileExecuting* handler) :
+            wxThread(wxTHREAD_DETACHED),
             readyToBeginProcessing(),
             beginProcessing(readyToBeginProcessing),
             threadIsInitialized(false),
diff --git a/library/processXml.cpp b/library/processXml.cpp
index 04048124..80ac190b 100644
--- a/library/processXml.cpp
+++ b/library/processXml.cpp
@@ -8,16 +8,16 @@ using namespace globalFunctions;
 using namespace xmlAccess;
 
 //small helper functions
-bool readXmlElementValue(string& output, const TiXmlElement* parent, const string& name);
-bool readXmlElementValue(int& output, const TiXmlElement* parent, const string& name);
-bool readXmlElementValue(CompareVariant& output, const TiXmlElement* parent, const string& name);
-bool readXmlElementValue(SyncConfiguration::Direction& output, const TiXmlElement* parent, const string& name);
-bool readXmlElementValue(bool& output, const TiXmlElement* parent, const string& name);
+bool readXmlElementValue(std::string& output,                  const TiXmlElement* parent, const std::string& name);
+bool readXmlElementValue(int& output,                          const TiXmlElement* parent, const std::string& name);
+bool readXmlElementValue(CompareVariant& output,               const TiXmlElement* parent, const std::string& name);
+bool readXmlElementValue(SyncConfiguration::Direction& output, const TiXmlElement* parent, const std::string& name);
+bool readXmlElementValue(bool& output,                         const TiXmlElement* parent, const std::string& name);
 
-void addXmlElement(TiXmlElement* parent, const string& name, const string& value);
-void addXmlElement(TiXmlElement* parent, const string& name, const int value);
-void addXmlElement(TiXmlElement* parent, const string& name, const SyncConfiguration::Direction value);
-void addXmlElement(TiXmlElement* parent, const string& name, const bool value);
+void addXmlElement(TiXmlElement* parent, const std::string& name, const std::string& value);
+void addXmlElement(TiXmlElement* parent, const std::string& name, const int value);
+void addXmlElement(TiXmlElement* parent, const std::string& name, const SyncConfiguration::Direction value);
+void addXmlElement(TiXmlElement* parent, const std::string& name, const bool value);
 
 
 class XmlConfigInput
@@ -40,7 +40,7 @@ public:
 
 private:
     //read basic FreefileSync settings (used by commandline and GUI), return true if ALL values have been retrieved successfully
-    bool readXmlMainConfig(MainConfiguration& mainCfg, vector<FolderPair>& directoryPairs);
+    bool readXmlMainConfig(MainConfiguration& mainCfg, std::vector<FolderPair>& directoryPairs);
 
     TiXmlDocument doc;
     bool loadSuccess;
@@ -56,15 +56,15 @@ public:
     bool writeToFile();
 
     //write gui settings
-    bool writeXmlGuiConfig(const XmlGuiConfig& inputCfg);
+    bool writeXmlGuiConfig(const XmlGuiConfig& outputCfg);
     //write batch settings
-    bool writeXmlBatchConfig(const XmlBatchConfig& inputCfg);
+    bool writeXmlBatchConfig(const XmlBatchConfig& outputCfg);
     //write global settings
-    bool writeXmlGlobalSettings(const XmlGlobalSettings& inputCfg);
+    bool writeXmlGlobalSettings(const XmlGlobalSettings& outputCfg);
 
 private:
     //write basic FreefileSync settings (used by commandline and GUI), return true if everything was written successfully
-    bool writeXmlMainConfig(const MainConfiguration& mainCfg, const vector<FolderPair>& directoryPairs);
+    bool writeXmlMainConfig(const MainConfiguration& mainCfg, const std::vector<FolderPair>& directoryPairs);
 
     TiXmlDocument doc;
     const wxString& m_fileName;
@@ -89,18 +89,18 @@ XmlType xmlAccess::getXmlType(const wxString& filename)
 
     TiXmlElement* root = doc.RootElement();
 
-    if (!root || (root->ValueStr() != string("FreeFileSync"))) //check for FFS configuration xml
+    if (!root || (root->ValueStr() != std::string("FreeFileSync"))) //check for FFS configuration xml
         return XML_OTHER;
 
     const char* cfgType = root->Attribute("XmlType");
     if (!cfgType)
         return XML_OTHER;
 
-    if (string(cfgType) == "BATCH")
+    if (std::string(cfgType) == "BATCH")
         return XML_BATCH_CONFIG;
-    else if (string(cfgType) == "GUI")
+    else if (std::string(cfgType) == "GUI")
         return XML_GUI_CONFIG;
-    else if (string(cfgType) == "GLOBAL")
+    else if (std::string(cfgType) == "GLOBAL")
         return XML_GLOBAL_SETTINGS;
     else
         return XML_OTHER;
@@ -115,10 +115,10 @@ XmlGuiConfig xmlAccess::readGuiConfig(const wxString& filename)
     XmlGuiConfig outputCfg;
 
     if (!inputFile.loadedSuccessfully())
-        throw FileError(wxString(_("Error reading file:")) + wxT(" \"") + filename + wxT("\""));
+        throw FileError(Zstring(_("Error reading file:")) + wxT(" \"") + filename.c_str() + wxT("\""));
 
     if (!inputFile.readXmlGuiConfig(outputCfg)) //read GUI layout configuration
-        throw FileError(wxString(_("Error parsing configuration file:")) + wxT(" \"") + filename + wxT("\""));
+        throw FileError(Zstring(_("Error parsing configuration file:")) + wxT(" \"") + filename.c_str() + wxT("\""));
 
     return outputCfg;
 }
@@ -132,10 +132,10 @@ XmlBatchConfig xmlAccess::readBatchConfig(const wxString& filename)
     XmlBatchConfig outputCfg;
 
     if (!inputFile.loadedSuccessfully())
-        throw FileError(wxString(_("Error reading file:")) + wxT(" \"") + filename + wxT("\""));
+        throw FileError(Zstring(_("Error reading file:")) + wxT(" \"") + filename.c_str() + wxT("\""));
 
     if (!inputFile.readXmlBatchConfig(outputCfg))
-        throw FileError(wxString(_("Error parsing configuration file:")) + wxT(" \"") + filename + wxT("\""));
+        throw FileError(Zstring(_("Error parsing configuration file:")) + wxT(" \"") + filename.c_str() + wxT("\""));
 
     return outputCfg;
 }
@@ -149,47 +149,47 @@ XmlGlobalSettings xmlAccess::readGlobalSettings()
     XmlGlobalSettings outputCfg;
 
     if (!inputFile.loadedSuccessfully())
-        throw FileError(wxString(_("Error reading file:")) + wxT(" \"") + FreeFileSync::GLOBAL_CONFIG_FILE + wxT("\""));
+        throw FileError(Zstring(_("Error reading file:")) + wxT(" \"") + FreeFileSync::GLOBAL_CONFIG_FILE.c_str() + wxT("\""));
 
     if (!inputFile.readXmlGlobalSettings(outputCfg))
-        throw FileError(wxString(_("Error parsing configuration file:")) + wxT(" \"") + FreeFileSync::GLOBAL_CONFIG_FILE + wxT("\""));
+        throw FileError(Zstring(_("Error parsing configuration file:")) + wxT(" \"") + FreeFileSync::GLOBAL_CONFIG_FILE.c_str() + wxT("\""));
 
     return outputCfg;
 }
 
 
-void xmlAccess::writeGuiConfig(const wxString& filename, const XmlGuiConfig& inputCfg)
+void xmlAccess::writeGuiConfig(const wxString& filename, const XmlGuiConfig& outputCfg)
 {
     XmlConfigOutput outputFile(filename, XML_GUI_CONFIG);
 
     //populate and write XML tree
-    if (    !outputFile.writeXmlGuiConfig(inputCfg) || //add GUI layout configuration settings
+    if (    !outputFile.writeXmlGuiConfig(outputCfg) || //add GUI layout configuration settings
             !outputFile.writeToFile()) //save XML
-        throw FileError(wxString(_("Error writing file:")) + wxT(" \"") + filename + wxT("\""));
+        throw FileError(Zstring(_("Error writing file:")) + wxT(" \"") + filename.c_str() + wxT("\""));
     return;
 }
 
 
-void xmlAccess::writeBatchConfig(const wxString& filename, const XmlBatchConfig& inputCfg)
+void xmlAccess::writeBatchConfig(const wxString& filename, const XmlBatchConfig& outputCfg)
 {
     XmlConfigOutput outputFile(filename, XML_BATCH_CONFIG);
 
     //populate and write XML tree
-    if (    !outputFile.writeXmlBatchConfig(inputCfg) || //add GUI layout configuration settings
+    if (    !outputFile.writeXmlBatchConfig(outputCfg) || //add GUI layout configuration settings
             !outputFile.writeToFile()) //save XML
-        throw FileError(wxString(_("Error writing file:")) + wxT(" \"") + filename + wxT("\""));
+        throw FileError(Zstring(_("Error writing file:")) + wxT(" \"") + filename.c_str() + wxT("\""));
     return;
 }
 
 
-void xmlAccess::writeGlobalSettings(const XmlGlobalSettings& inputCfg)
+void xmlAccess::writeGlobalSettings(const XmlGlobalSettings& outputCfg)
 {
     XmlConfigOutput outputFile(FreeFileSync::GLOBAL_CONFIG_FILE, XML_GLOBAL_SETTINGS);
 
     //populate and write XML tree
-    if (    !outputFile.writeXmlGlobalSettings(inputCfg) || //add GUI layout configuration settings
+    if (    !outputFile.writeXmlGlobalSettings(outputCfg) || //add GUI layout configuration settings
             !outputFile.writeToFile()) //save XML
-        throw FileError(wxString(_("Error writing file:")) + wxT(" \"") + FreeFileSync::GLOBAL_CONFIG_FILE + wxT("\""));
+        throw FileError(Zstring(_("Error writing file:")) + wxT(" \"") + FreeFileSync::GLOBAL_CONFIG_FILE.c_str() + wxT("\""));
     return;
 }
 
@@ -212,17 +212,17 @@ XmlConfigInput::XmlConfigInput(const wxString& fileName, const XmlType type) :
         {
             TiXmlElement* root = doc.RootElement();
 
-            if (root && (root->ValueStr() == string("FreeFileSync"))) //check for FFS configuration xml
+            if (root && (root->ValueStr() == std::string("FreeFileSync"))) //check for FFS configuration xml
             {
                 const char* cfgType = root->Attribute("XmlType");
                 if (cfgType)
                 {
                     if (type == XML_GUI_CONFIG)
-                        loadSuccess = string(cfgType) == "GUI";
+                        loadSuccess = std::string(cfgType) == "GUI";
                     else if (type == XML_BATCH_CONFIG)
-                        loadSuccess = string(cfgType) == "BATCH";
+                        loadSuccess = std::string(cfgType) == "BATCH";
                     else if (type == XML_GLOBAL_SETTINGS)
-                        loadSuccess = string(cfgType) == "GLOBAL";
+                        loadSuccess = std::string(cfgType) == "GLOBAL";
                 }
             }
         }
@@ -230,7 +230,7 @@ XmlConfigInput::XmlConfigInput(const wxString& fileName, const XmlType type) :
 }
 
 
-bool readXmlElementValue(string& output, const TiXmlElement* parent, const string& name)
+bool readXmlElementValue(std::string& output, const TiXmlElement* parent, const std::string& name)
 {
     if (parent)
     {
@@ -250,9 +250,9 @@ bool readXmlElementValue(string& output, const TiXmlElement* parent, const strin
 }
 
 
-bool readXmlElementValue(int& output, const TiXmlElement* parent, const string& name)
+bool readXmlElementValue(int& output, const TiXmlElement* parent, const std::string& name)
 {
-    string temp;
+    std::string temp;
     if (readXmlElementValue(temp, parent, name))
     {
         output = stringToInt(temp);
@@ -263,7 +263,7 @@ bool readXmlElementValue(int& output, const TiXmlElement* parent, const string&
 }
 
 
-bool readXmlElementValue(CompareVariant& output, const TiXmlElement* parent, const string& name)
+bool readXmlElementValue(CompareVariant& output, const TiXmlElement* parent, const std::string& name)
 {
     int dummy = 0;
     if (readXmlElementValue(dummy, parent, name))
@@ -276,9 +276,9 @@ bool readXmlElementValue(CompareVariant& output, const TiXmlElement* parent, con
 }
 
 
-bool readXmlElementValue(SyncConfiguration::Direction& output, const TiXmlElement* parent, const string& name)
+bool readXmlElementValue(SyncConfiguration::Direction& output, const TiXmlElement* parent, const std::string& name)
 {
-    string dummy;
+    std::string dummy;
     if (readXmlElementValue(dummy, parent, name))
     {
         if (dummy == "left")
@@ -295,9 +295,9 @@ bool readXmlElementValue(SyncConfiguration::Direction& output, const TiXmlElemen
 }
 
 
-bool readXmlElementValue(bool& output, const TiXmlElement* parent, const string& name)
+bool readXmlElementValue(bool& output, const TiXmlElement* parent, const std::string& name)
 {
-    string dummy;
+    std::string dummy;
     if (readXmlElementValue(dummy, parent, name))
     {
         output = (dummy == "true");
@@ -308,7 +308,7 @@ bool readXmlElementValue(bool& output, const TiXmlElement* parent, const string&
 }
 
 
-bool XmlConfigInput::readXmlMainConfig(MainConfiguration& mainCfg, vector<FolderPair>& directoryPairs)
+bool XmlConfigInput::readXmlMainConfig(MainConfiguration& mainCfg, std::vector<FolderPair>& directoryPairs)
 {
     TiXmlElement* root = doc.RootElement();
     if (!root) return false;
@@ -323,7 +323,7 @@ bool XmlConfigInput::readXmlMainConfig(MainConfiguration& mainCfg, vector<Folder
     if (!cmpSettings || !syncConfig || !miscSettings || !filter)
         return false;
 
-    string tempString;
+    std::string tempString;
 //###########################################################
     //read compare variant
     if (!readXmlElementValue(mainCfg.compareVar, cmpSettings, "Variant")) return false;
@@ -435,7 +435,7 @@ bool XmlConfigInput::readXmlGlobalSettings(XmlGlobalSettings& outputCfg)
 
 #ifdef FFS_WIN
     //daylight saving time check
-    readXmlElementValue(outputCfg.global.dstCheckActive, global, "DaylightSavingTimeCheckActive");
+    readXmlElementValue(outputCfg.global.handleDstOnFat32, global, "HandleDaylightSavingTimeOnFAT");
 #endif
 
     //folder dependency check
@@ -453,50 +453,78 @@ bool XmlConfigInput::readXmlGlobalSettings(XmlGlobalSettings& outputCfg)
         readXmlElementValue(outputCfg.gui.isMaximized, mainWindow, "Maximized");
 
 //###########################################################
-        //read column widths
-        TiXmlElement* leftColumn = TiXmlHandle(mainWindow).FirstChild("LeftColumns").FirstChild("Width").ToElement();
+        //read column attributes
+        TiXmlElement* leftColumn = TiXmlHandle(mainWindow).FirstChild("LeftColumns").FirstChild("Column").ToElement();
+        unsigned int colType = 0;
         while (leftColumn)
         {
-            const char* width = leftColumn->GetText();
-            if (width) //may be NULL!!
-                outputCfg.gui.columnWidthLeft.push_back(stringToInt(width));
+            const char* visible  = leftColumn->Attribute("Visible");
+            const char* position = leftColumn->Attribute("Position");
+            const char* width    = leftColumn->Attribute("Width");
+
+            if (visible && position && width) //may be NULL!!
+            {
+                XmlGlobalSettings::ColumnAttrib newAttrib;
+                newAttrib.type     = XmlGlobalSettings::ColumnTypes(colType);
+                newAttrib.visible  = std::string(visible) != std::string("false");
+                newAttrib.position = stringToInt(position);
+                newAttrib.width    = stringToInt(width);
+                outputCfg.gui.columnAttribLeft.push_back(newAttrib);
+            }
             else
                 break;
+
             leftColumn = leftColumn->NextSiblingElement();
+            ++colType;
         }
 
-        TiXmlElement* rightColumn = TiXmlHandle(mainWindow).FirstChild("RightColumns").FirstChild("Width").ToElement();
+        TiXmlElement* rightColumn = TiXmlHandle(mainWindow).FirstChild("RightColumns").FirstChild("Column").ToElement();
+        colType = 0;
         while (rightColumn)
         {
-            const char* width = rightColumn->GetText();
-            if (width) //may be NULL!!
-                outputCfg.gui.columnWidthRight.push_back(stringToInt(width));
+            const char* visible  = rightColumn->Attribute("Visible");
+            const char* position = rightColumn->Attribute("Position");
+            const char* width    = rightColumn->Attribute("Width");
+
+            if (visible && position && width) //may be NULL!!
+            {
+                XmlGlobalSettings::ColumnAttrib newAttrib;
+                newAttrib.type     = XmlGlobalSettings::ColumnTypes(colType);
+                newAttrib.visible  = std::string(visible) != std::string("false");
+                newAttrib.position = stringToInt(position);
+                newAttrib.width    = stringToInt(width);
+                outputCfg.gui.columnAttribRight.push_back(newAttrib);
+            }
             else
                 break;
+
             rightColumn = rightColumn->NextSiblingElement();
+            ++colType;
         }
+    }
 
-        //read column positions
-        TiXmlElement* leftColumnPos = TiXmlHandle(mainWindow).FirstChild("LeftColumnPositions").FirstChild("Position").ToElement();
-        while (leftColumnPos)
-        {
-            const char* width = leftColumnPos->GetText();
-            if (width) //may be NULL!!
-                outputCfg.gui.columnPositionsLeft.push_back(stringToInt(width));
-            else
-                break;
-            leftColumnPos = leftColumnPos->NextSiblingElement();
-        }
+    TiXmlElement* gui = hRoot.FirstChild("Gui").ToElement();
+    if (gui)
+    {
+        //commandline for file manager integration
+        std::string  tempString;
+        if (readXmlElementValue(tempString, gui, "FileManager"))
+            outputCfg.gui.commandLineFileManager = wxString::FromUTF8(tempString.c_str());
+    }
 
-        TiXmlElement* rightColumnPos = TiXmlHandle(mainWindow).FirstChild("RightColumnPositions").FirstChild("Position").ToElement();
-        while (rightColumnPos)
+    //load config file history
+    TiXmlElement* cfgHistory = hRoot.FirstChild("Gui").FirstChild("History").ToElement();
+    if (cfgHistory)
+    {
+        TiXmlElement* cfgFile = TiXmlHandle(cfgHistory).FirstChild("File").ToElement();
+        while (cfgFile)
         {
-            const char* width = rightColumnPos->GetText();
-            if (width) //may be NULL!!
-                outputCfg.gui.columnPositionsRight.push_back(stringToInt(width));
+            const char* fileName = cfgFile->GetText();
+            if (fileName) //may be NULL!!
+                outputCfg.gui.cfgFileHistory.push_back(wxString::FromUTF8(fileName));
             else
                 break;
-            rightColumnPos = rightColumnPos->NextSiblingElement();
+            cfgFile = cfgFile->NextSiblingElement();
         }
     }
 
@@ -546,7 +574,7 @@ bool XmlConfigOutput::writeToFile()
 }
 
 
-void addXmlElement(TiXmlElement* parent, const string& name, const string& value)
+void addXmlElement(TiXmlElement* parent, const std::string& name, const std::string& value)
 {
     if (parent)
     {
@@ -557,35 +585,35 @@ void addXmlElement(TiXmlElement* parent, const string& name, const string& value
 }
 
 
-void addXmlElement(TiXmlElement* parent, const string& name, const int value)
+void addXmlElement(TiXmlElement* parent, const std::string& name, const int value)
 {
     addXmlElement(parent, name, numberToString(value));
 }
 
 
-void addXmlElement(TiXmlElement* parent, const string& name, const SyncConfiguration::Direction value)
+void addXmlElement(TiXmlElement* parent, const std::string& name, const SyncConfiguration::Direction value)
 {
     if (value == SyncConfiguration::SYNC_DIR_LEFT)
-        addXmlElement(parent, name, string("left"));
+        addXmlElement(parent, name, std::string("left"));
     else if (value == SyncConfiguration::SYNC_DIR_RIGHT)
-        addXmlElement(parent, name, string("right"));
+        addXmlElement(parent, name, std::string("right"));
     else if (value == SyncConfiguration::SYNC_DIR_NONE)
-        addXmlElement(parent, name, string("none"));
+        addXmlElement(parent, name, std::string("none"));
     else
         assert(false);
 }
 
 
-void addXmlElement(TiXmlElement* parent, const string& name, const bool value)
+void addXmlElement(TiXmlElement* parent, const std::string& name, const bool value)
 {
     if (value)
-        addXmlElement(parent, name, string("true"));
+        addXmlElement(parent, name, std::string("true"));
     else
-        addXmlElement(parent, name, string("false"));
+        addXmlElement(parent, name, std::string("false"));
 }
 
 
-bool XmlConfigOutput::writeXmlMainConfig(const MainConfiguration& mainCfg, const vector<FolderPair>& directoryPairs)
+bool XmlConfigOutput::writeXmlMainConfig(const MainConfiguration& mainCfg, const std::vector<FolderPair>& directoryPairs)
 {
     TiXmlElement* root = doc.RootElement();
     if (!root) return false;
@@ -605,13 +633,13 @@ bool XmlConfigOutput::writeXmlMainConfig(const MainConfiguration& mainCfg, const
     cmpSettings->LinkEndChild(folders);
 
     //write folder pairs
-    for (vector<FolderPair>::const_iterator i = directoryPairs.begin(); i != directoryPairs.end(); ++i)
+    for (std::vector<FolderPair>::const_iterator i = directoryPairs.begin(); i != directoryPairs.end(); ++i)
     {
         TiXmlElement* folderPair = new TiXmlElement("Pair");
         folders->LinkEndChild(folderPair);
 
-        addXmlElement(folderPair, "Left", string(wxString(i->leftDirectory.c_str()).ToUTF8()));
-        addXmlElement(folderPair, "Right", string(wxString(i->rightDirectory.c_str()).ToUTF8()));
+        addXmlElement(folderPair, "Left", std::string(wxString(i->leftDirectory.c_str()).ToUTF8()));
+        addXmlElement(folderPair, "Right", std::string(wxString(i->rightDirectory.c_str()).ToUTF8()));
     }
 
 //###########################################################
@@ -637,8 +665,8 @@ bool XmlConfigOutput::writeXmlMainConfig(const MainConfiguration& mainCfg, const
     miscSettings->LinkEndChild(filter);
 
     addXmlElement(filter, "Active", mainCfg.filterIsActive);
-    addXmlElement(filter, "Include", string((mainCfg.includeFilter).ToUTF8()));
-    addXmlElement(filter, "Exclude", string((mainCfg.excludeFilter).ToUTF8()));
+    addXmlElement(filter, "Include", std::string((mainCfg.includeFilter).ToUTF8()));
+    addXmlElement(filter, "Exclude", std::string((mainCfg.excludeFilter).ToUTF8()));
 
     //other
     addXmlElement(miscSettings, "UseRecycler", mainCfg.useRecycleBin);
@@ -649,10 +677,10 @@ bool XmlConfigOutput::writeXmlMainConfig(const MainConfiguration& mainCfg, const
 }
 
 
-bool XmlConfigOutput::writeXmlGuiConfig(const XmlGuiConfig& inputCfg)
+bool XmlConfigOutput::writeXmlGuiConfig(const XmlGuiConfig& outputCfg)
 {
     //write main config
-    if (!writeXmlMainConfig(inputCfg.mainCfg, inputCfg.directoryPairs))
+    if (!writeXmlMainConfig(outputCfg.mainCfg, outputCfg.directoryPairs))
         return false;
 
     //write GUI specific config
@@ -668,16 +696,16 @@ bool XmlConfigOutput::writeXmlGuiConfig(const XmlGuiConfig& inputCfg)
     TiXmlElement* mainWindow = new TiXmlElement("Main");
     windows->LinkEndChild(mainWindow);
 
-    addXmlElement(mainWindow, "HideFiltered", inputCfg.hideFilteredElements);
+    addXmlElement(mainWindow, "HideFiltered", outputCfg.hideFilteredElements);
 
     return true;
 }
 
 
-bool XmlConfigOutput::writeXmlBatchConfig(const XmlBatchConfig& inputCfg)
+bool XmlConfigOutput::writeXmlBatchConfig(const XmlBatchConfig& outputCfg)
 {
     //write main config
-    if (!writeXmlMainConfig(inputCfg.mainCfg, inputCfg.directoryPairs))
+    if (!writeXmlMainConfig(outputCfg.mainCfg, outputCfg.directoryPairs))
         return false;
 
     //write GUI specific config
@@ -687,13 +715,13 @@ bool XmlConfigOutput::writeXmlBatchConfig(const XmlBatchConfig& inputCfg)
     TiXmlElement* batchConfig = new TiXmlElement("BatchConfig");
     root->LinkEndChild(batchConfig);
 
-    addXmlElement(batchConfig, "Silent", inputCfg.silent);
+    addXmlElement(batchConfig, "Silent", outputCfg.silent);
 
     return true;
 }
 
 
-bool XmlConfigOutput::writeXmlGlobalSettings(const XmlGlobalSettings& inputCfg)
+bool XmlConfigOutput::writeXmlGlobalSettings(const XmlGlobalSettings& outputCfg)
 {
     TiXmlElement* root = doc.RootElement();
     if (!root) return false;
@@ -704,64 +732,83 @@ bool XmlConfigOutput::writeXmlGlobalSettings(const XmlGlobalSettings& inputCfg)
     root->LinkEndChild(global);
 
     //program language
-    addXmlElement(global, "Language", inputCfg.global.programLanguage);
+    addXmlElement(global, "Language", outputCfg.global.programLanguage);
 
 #ifdef FFS_WIN
     //daylight saving time check
-    addXmlElement(global, "DaylightSavingTimeCheckActive", inputCfg.global.dstCheckActive);
+    addXmlElement(global, "HandleDaylightSavingTimeOnFAT", outputCfg.global.handleDstOnFat32);
 #endif
 
     //folder dependency check
-    addXmlElement(global, "FolderDependencyCheckActive", inputCfg.global.folderDependCheckActive);
+    addXmlElement(global, "FolderDependencyCheckActive", outputCfg.global.folderDependCheckActive);
+
 
     //###################################################################
-    //write gui settings
-    TiXmlElement* guiLayout = new TiXmlElement("Gui");
-    root->LinkEndChild(guiLayout);
+    //write global gui settings
+    TiXmlElement* gui = new TiXmlElement("Gui");
+    root->LinkEndChild(gui);
 
     TiXmlElement* windows = new TiXmlElement("Windows");
-    guiLayout->LinkEndChild(windows);
+    gui->LinkEndChild(windows);
 
     TiXmlElement* mainWindow = new TiXmlElement("Main");
     windows->LinkEndChild(mainWindow);
 
     //window size
-    addXmlElement(mainWindow, "Width", inputCfg.gui.widthNotMaximized);
-    addXmlElement(mainWindow, "Height", inputCfg.gui.heightNotMaximized);
+    addXmlElement(mainWindow, "Width", outputCfg.gui.widthNotMaximized);
+    addXmlElement(mainWindow, "Height", outputCfg.gui.heightNotMaximized);
 
     //window position
-    addXmlElement(mainWindow, "PosX", inputCfg.gui.posXNotMaximized);
-    addXmlElement(mainWindow, "PosY", inputCfg.gui.posYNotMaximized);
-    addXmlElement(mainWindow, "Maximized", inputCfg.gui.isMaximized);
+    addXmlElement(mainWindow, "PosX", outputCfg.gui.posXNotMaximized);
+    addXmlElement(mainWindow, "PosY", outputCfg.gui.posYNotMaximized);
+    addXmlElement(mainWindow, "Maximized", outputCfg.gui.isMaximized);
 
-    //write column sizes
+    //write column attributes
     TiXmlElement* leftColumn = new TiXmlElement("LeftColumns");
     mainWindow->LinkEndChild(leftColumn);
-
-    for (unsigned int i = 0; i < inputCfg.gui.columnWidthLeft.size(); ++i)
-        addXmlElement(leftColumn, "Width", inputCfg.gui.columnWidthLeft[i]);
+    XmlGlobalSettings::ColumnAttributes columnAtrribLeftCopy = outputCfg.gui.columnAttribLeft; //can't change const vector
+    sort(columnAtrribLeftCopy.begin(), columnAtrribLeftCopy.end(), xmlAccess::sortByType);
+    for (unsigned int i = 0; i < columnAtrribLeftCopy.size(); ++i)
+    {
+        TiXmlElement* subElement = new TiXmlElement("Column");
+        leftColumn->LinkEndChild(subElement);
+
+        const XmlGlobalSettings::ColumnAttrib& colAttrib = columnAtrribLeftCopy[i];
+        if (colAttrib.visible) subElement->SetAttribute("Visible", "true");
+        else subElement->SetAttribute("Visible", "false");
+        subElement->SetAttribute("Position", colAttrib.position);
+        subElement->SetAttribute("Width", colAttrib.width);
+    }
 
     TiXmlElement* rightColumn = new TiXmlElement("RightColumns");
     mainWindow->LinkEndChild(rightColumn);
+    XmlGlobalSettings::ColumnAttributes columnAtrribRightCopy = outputCfg.gui.columnAttribRight;
+    sort(columnAtrribRightCopy.begin(), columnAtrribRightCopy.end(), xmlAccess::sortByType);
+    for (unsigned int i = 0; i < columnAtrribRightCopy.size(); ++i)
+    {
+        TiXmlElement* subElement = new TiXmlElement("Column");
+        rightColumn->LinkEndChild(subElement);
+
+        const XmlGlobalSettings::ColumnAttrib& colAttrib = columnAtrribRightCopy[i];
+        if (colAttrib.visible) subElement->SetAttribute("Visible", "true");
+        else subElement->SetAttribute("Visible", "false");
+        subElement->SetAttribute("Position", colAttrib.position);
+        subElement->SetAttribute("Width", colAttrib.width);
+    }
 
-    for (unsigned int i = 0; i < inputCfg.gui.columnWidthRight.size(); ++i)
-        addXmlElement(rightColumn, "Width", inputCfg.gui.columnWidthRight[i]);
-
-    //write column positions
-    TiXmlElement* leftColumnPos = new TiXmlElement("LeftColumnPositions");
-    mainWindow->LinkEndChild(leftColumnPos);
+    //commandline for file manager integration
+    addXmlElement(gui, "FileManager", std::string((outputCfg.gui.commandLineFileManager).ToUTF8()));
 
-    for (unsigned int i = 0; i < inputCfg.gui.columnPositionsLeft.size(); ++i)
-        addXmlElement(leftColumnPos, "Position", inputCfg.gui.columnPositionsLeft[i]);
+    //write config file history
+    TiXmlElement* cfgHistory = new TiXmlElement("History");
+    gui->LinkEndChild(cfgHistory);
 
-    TiXmlElement* rightColumnPos = new TiXmlElement("RightColumnPositions");
-    mainWindow->LinkEndChild(rightColumnPos);
+    for (unsigned int i = 0; i < outputCfg.gui.cfgFileHistory.size(); ++i)
+        addXmlElement(cfgHistory, "File", std::string(outputCfg.gui.cfgFileHistory[i].ToUTF8()));
 
-    for (unsigned int i = 0; i < inputCfg.gui.columnPositionsRight.size(); ++i)
-        addXmlElement(rightColumnPos, "Position", inputCfg.gui.columnPositionsRight[i]);
 
     //###################################################################
-    //write batch settings
+    //write global batch settings
 
     TiXmlElement* batch = new TiXmlElement("Batch");
     root->LinkEndChild(batch);
@@ -770,12 +817,13 @@ bool XmlConfigOutput::writeXmlGlobalSettings(const XmlGlobalSettings& inputCfg)
 }
 
 
-int xmlAccess::retrieveSystemLanguage() //map language dialects
+int xmlAccess::retrieveSystemLanguage()
 {
     const int lang = wxLocale::GetSystemLanguage();
 
-    switch (lang)
+    switch (lang) //map language dialects
     {
+        //variants of wxLANGUAGE_GERMAN
     case wxLANGUAGE_GERMAN_AUSTRIAN:
     case wxLANGUAGE_GERMAN_BELGIUM:
     case wxLANGUAGE_GERMAN_LIECHTENSTEIN:
@@ -783,6 +831,7 @@ int xmlAccess::retrieveSystemLanguage() //map language dialects
     case wxLANGUAGE_GERMAN_SWISS:
         return wxLANGUAGE_GERMAN;
 
+        //variants of wxLANGUAGE_FRENCH
     case wxLANGUAGE_FRENCH_BELGIAN:
     case wxLANGUAGE_FRENCH_CANADIAN:
     case wxLANGUAGE_FRENCH_LUXEMBOURG:
@@ -790,11 +839,15 @@ int xmlAccess::retrieveSystemLanguage() //map language dialects
     case wxLANGUAGE_FRENCH_SWISS:
         return wxLANGUAGE_FRENCH;
 
-        //case wxLANGUAGE_JAPANESE:
-
+        //variants of wxLANGUAGE_DUTCH
     case wxLANGUAGE_DUTCH_BELGIAN:
         return wxLANGUAGE_DUTCH;
 
+        //variants of wxLANGUAGE_ITALIAN
+    case wxLANGUAGE_ITALIAN_SWISS:
+        return wxLANGUAGE_ITALIAN;
+
+        //variants of wxLANGUAGE_CHINESE_SIMPLIFIED
     case wxLANGUAGE_CHINESE:
     case wxLANGUAGE_CHINESE_TRADITIONAL:
     case wxLANGUAGE_CHINESE_HONGKONG:
@@ -803,7 +856,16 @@ int xmlAccess::retrieveSystemLanguage() //map language dialects
     case wxLANGUAGE_CHINESE_TAIWAN:
         return wxLANGUAGE_CHINESE_SIMPLIFIED;
 
+        //variants of wxLANGUAGE_PORTUGUESE
+    case wxLANGUAGE_PORTUGUESE_BRAZILIAN:
+        return wxLANGUAGE_PORTUGUESE;
+
+        //case wxLANGUAGE_JAPANESE:
+        //case wxLANGUAGE_POLISH:
+
+
     default:
+        //all the rest: wxLANGUAGE_ENGLISH;
         return lang;
     }
 }
diff --git a/library/processXml.h b/library/processXml.h
index bc81556e..5f3f8ef9 100644
--- a/library/processXml.h
+++ b/library/processXml.h
@@ -25,7 +25,7 @@ namespace xmlAccess
         XmlGuiConfig() : hideFilteredElements(false) {} //initialize values
 
         MainConfiguration mainCfg;
-        vector<FolderPair> directoryPairs;
+        std::vector<FolderPair> directoryPairs;
 
         bool hideFilteredElements;
     };
@@ -36,31 +36,53 @@ namespace xmlAccess
         XmlBatchConfig() :  silent(false) {}
 
         MainConfiguration mainCfg;
-        vector<FolderPair> directoryPairs;
+        std::vector<FolderPair> directoryPairs;
 
         bool silent;
     };
 
     int retrieveSystemLanguage();
 
+
     struct XmlGlobalSettings
     {
+//---------------------------------------------------------------------
+//internal structures:
+        enum ColumnTypes
+        {
+            FILENAME = 0,
+            REL_PATH,
+            SIZE,
+            DATE
+        };
+
+        struct ColumnAttrib
+        {
+            ColumnTypes type;
+            bool        visible;
+            unsigned    position;
+            int         width;
+        };
+        typedef std::vector<ColumnAttrib> ColumnAttributes;
+
+//---------------------------------------------------------------------
         struct _Global
         {
             _Global() :
                     programLanguage(retrieveSystemLanguage()),
 #ifdef FFS_WIN
-                    dstCheckActive(true),
+                    handleDstOnFat32(true),
 #endif
                     folderDependCheckActive(true) {}
 
             int programLanguage;
 #ifdef FFS_WIN
-            bool dstCheckActive;
+            bool handleDstOnFat32;
 #endif
             bool folderDependCheckActive;
         } global;
 
+//---------------------------------------------------------------------
         struct _Gui
         {
             _Gui() :
@@ -68,30 +90,63 @@ namespace xmlAccess
                     heightNotMaximized(wxDefaultCoord),
                     posXNotMaximized(wxDefaultCoord),
                     posYNotMaximized(wxDefaultCoord),
-                    isMaximized(false) {}
+                    isMaximized(false),
+#ifdef FFS_WIN
+                    commandLineFileManager(wxT("explorer /select, %x"))
+#elif defined FFS_LINUX
+                    commandLineFileManager(wxT("konqueror \"%path\""))
+#endif
+            {}
 
             int widthNotMaximized;
             int heightNotMaximized;
             int posXNotMaximized;
             int posYNotMaximized;
             bool isMaximized;
-            vector<int> columnWidthLeft;
-            vector<int> columnWidthRight;
-            vector<int> columnPositionsLeft;
-            vector<int> columnPositionsRight;
+
+            ColumnAttributes columnAttribLeft;
+            ColumnAttributes columnAttribRight;
+            std::vector<wxString> cfgFileHistory;
+            wxString commandLineFileManager;
         } gui;
 
+//---------------------------------------------------------------------
         //struct _Batch
     };
 
 
+    inline
+    bool sortByType(const XmlGlobalSettings::ColumnAttrib& a, const XmlGlobalSettings::ColumnAttrib& b)
+    {
+        return a.type < b.type;
+    }
+
+
+    inline
+    bool sortByPositionOnly(const XmlGlobalSettings::ColumnAttrib& a, const XmlGlobalSettings::ColumnAttrib& b)
+    {
+        return a.position < b.position;
+    }
+
+
+    inline
+    bool sortByPositionAndVisibility(const XmlGlobalSettings::ColumnAttrib& a, const XmlGlobalSettings::ColumnAttrib& b)
+    {
+        if (a.visible == false) //hidden elements shall appear at end of vector
+            return false;
+        if (b.visible == false)
+            return true;
+        return a.position < b.position;
+    }
+
+
     XmlGuiConfig readGuiConfig(const wxString& filename);
     XmlBatchConfig readBatchConfig(const wxString& filename);
     XmlGlobalSettings readGlobalSettings();   //used for both GUI and batch mode, independent from configuration instance
 
-    void writeGuiConfig(const wxString& filename, const XmlGuiConfig& inputCfg);
-    void writeBatchConfig(const wxString& filename, const XmlBatchConfig& inputCfg);
-    void writeGlobalSettings(const XmlGlobalSettings& inputCfg);
+    void writeGuiConfig(const wxString& filename, const XmlGuiConfig& outputCfg);
+    void writeBatchConfig(const wxString& filename, const XmlBatchConfig& outputCfg);
+    void writeGlobalSettings(const XmlGlobalSettings& outputCfg);
 
 }
 
diff --git a/library/resources.cpp b/library/resources.cpp
index 9169bf85..c60c259c 100644
--- a/library/resources.cpp
+++ b/library/resources.cpp
@@ -92,6 +92,12 @@ GlobalResources::GlobalResources()
     bitmapResource[wxT("filter.png")]             = (bitmapFilter            = new wxBitmap(wxNullBitmap));
     bitmapResource[wxT("batch.png")]              = (bitmapBatch             = new wxBitmap(wxNullBitmap));
     bitmapResource[wxT("batch_small.png")]        = (bitmapBatchSmall        = new wxBitmap(wxNullBitmap));
+    bitmapResource[wxT("move up.png")]            = (bitmapMoveUp            = new wxBitmap(wxNullBitmap));
+    bitmapResource[wxT("move down.png")]          = (bitmapMoveDown          = new wxBitmap(wxNullBitmap));
+    bitmapResource[wxT("checkbox true.png")]      = (bitmapCheckBoxTrue      = new wxBitmap(wxNullBitmap));
+    bitmapResource[wxT("checkbox false.png")]     = (bitmapCheckBoxFalse     = new wxBitmap(wxNullBitmap));
+    bitmapResource[wxT("settings.png")]           = (bitmapSettings          = new wxBitmap(wxNullBitmap));
+    bitmapResource[wxT("settings_small.png")]     = (bitmapSettingsSmall     = new wxBitmap(wxNullBitmap));
 
     //init all the other resource files
     animationMoney = new wxAnimation(wxNullAnimation);
@@ -102,7 +108,7 @@ GlobalResources::GlobalResources()
 GlobalResources::~GlobalResources()
 {
     //free bitmap resources
-    for (map<wxString, wxBitmap*>::iterator i = bitmapResource.begin(); i != bitmapResource.end(); ++i)
+    for (std::map<wxString, wxBitmap*>::iterator i = bitmapResource.begin(); i != bitmapResource.end(); ++i)
         delete i->second;
 
     //free other resources
@@ -117,7 +123,7 @@ void loadAnimFromZip(wxZipInputStream& zipInput, wxAnimation* animation)
     //Workaround for wxWidgets:
     //construct seekable input stream (zip-input stream is non-seekable) for wxAnimation::Load()
     //luckily this method call is very fast: below measurement precision!
-    vector<unsigned char> data;
+    std::vector<unsigned char> data;
     data.reserve(10000);
 
     int newValue = 0;
@@ -141,7 +147,7 @@ void GlobalResources::load()
         wxZipInputStream resourceFile(input);
 
         wxZipEntry* entry = NULL;
-        map<wxString, wxBitmap*>::iterator bmp;
+        std::map<wxString, wxBitmap*>::iterator bmp;
         while ((entry = resourceFile.GetNextEntry()))
         {
             wxString name = entry->GetName();
diff --git a/library/resources.h b/library/resources.h
index d08ce0ce..4eec185e 100644
--- a/library/resources.h
+++ b/library/resources.h
@@ -6,7 +6,6 @@
 #include <wx/string.h>
 #include <map>
 
-using namespace std;
 
 class GlobalResources
 {
@@ -92,6 +91,12 @@ public:
     wxBitmap* bitmapFilter;
     wxBitmap* bitmapBatch;
     wxBitmap* bitmapBatchSmall;
+    wxBitmap* bitmapMoveUp;
+    wxBitmap* bitmapMoveDown;
+    wxBitmap* bitmapCheckBoxTrue;
+    wxBitmap* bitmapCheckBoxFalse;
+    wxBitmap* bitmapSettings;
+    wxBitmap* bitmapSettingsSmall;
 
     wxAnimation* animationMoney;
     wxAnimation* animationSync;
@@ -100,7 +105,7 @@ public:
 
 private:
     //resource mapping
-    map<wxString, wxBitmap*> bitmapResource;
+    std::map<wxString, wxBitmap*> bitmapResource;
 };
 
 
diff --git a/library/sorting.h b/library/sorting.h
index 560e246a..fabdad1f 100644
--- a/library/sorting.h
+++ b/library/sorting.h
@@ -5,6 +5,7 @@
 #include "resources.h"
 #include "globalFunctions.h"
 
+using namespace FreeFileSync;
 
 enum SideToSort
 {
@@ -115,11 +116,11 @@ bool sortByFileName(const FileCompareLine& a, const FileCompareLine& b)
         const wxChar* stringB = descrLineB->relativeName.c_str();
 
         size_t pos = descrLineA->relativeName.Find(GlobalResources::FILE_NAME_SEPARATOR, true); //start search beginning from end
-        if (pos != string::npos)
+        if (pos != std::string::npos)
             stringA += pos + 1;
 
         pos = descrLineB->relativeName.Find(GlobalResources::FILE_NAME_SEPARATOR, true); //start search beginning from end
-        if (pos != string::npos)
+        if (pos != std::string::npos)
             stringB += pos + 1;
 
         return stringSmallerThan<sortAscending>(stringA, stringB);
@@ -250,4 +251,20 @@ bool sortByDate(const FileCompareLine& a, const FileCompareLine& b)
 }
 
 
+template <bool sortAscending>
+inline
+bool sortByCmpResult(const FileCompareLine& a, const FileCompareLine& b)
+{
+    //presort result: equal shall appear at end of list
+    if (a.cmpResult == FILE_EQUAL)
+        return false;
+    if (b.cmpResult == FILE_EQUAL)
+        return true;
+
+    return sortAscending ?
+           a.cmpResult < b.cmpResult :
+           a.cmpResult > b.cmpResult;
+}
+
+
 #endif // SORTING_H_INCLUDED
diff --git a/library/statusHandler.h b/library/statusHandler.h
index 4c12035d..bae1de8e 100644
--- a/library/statusHandler.h
+++ b/library/statusHandler.h
@@ -1,7 +1,7 @@
 #ifndef STATUSHANDLER_H_INCLUDED
 #define STATUSHANDLER_H_INCLUDED
 
-#include <wx/string.h>
+#include "zstring.h"
 
 
 const int UI_UPDATE_INTERVAL = 100; //perform ui updates not more often than necessary, 100 seems to be a good value with only a minimal performance loss
@@ -24,7 +24,7 @@ public:
         IGNORE_ERROR = 10,
         RETRY
     };
-    virtual Response reportError(const wxString& text) = 0;
+    virtual Response reportError(const Zstring& text) = 0;
 };
 
 
@@ -45,10 +45,10 @@ public:
     };
 
     //these methods have to be implemented in the derived classes to handle error and status information
-    virtual void updateStatusText(const wxString& text) = 0;
+    virtual void updateStatusText(const Zstring& text) = 0;
     virtual void initNewProcess(int objectsTotal, double dataTotal, Process processID) = 0; //informs about the total amount of data that will be processed from now on
     virtual void updateProcessedData(int objectsProcessed, double dataProcessed) = 0;  //called periodically after data was processed
-    virtual ErrorHandler::Response reportError(const wxString& text) = 0;
+    virtual ErrorHandler::Response reportError(const Zstring& text) = 0;
 
     //this method is triggered repeatedly by requestUiRefresh() and can be used to refresh the ui by dispatching pending events
     virtual void forceUiRefresh() = 0;
diff --git a/library/zstring.cpp b/library/zstring.cpp
index b84c9512..35704b01 100644
--- a/library/zstring.cpp
+++ b/library/zstring.cpp
@@ -44,14 +44,14 @@ int FreeFileSync::compareStringsWin32(const wchar_t* a, const wchar_t* b, const
                  bCount); 	          //size, in bytes or characters, of second string
 
     if (rv == 0)
-        throw RuntimeException(wxString(_("Error comparing strings!")));
+        throw RuntimeException(wxString(wxT("Error comparing strings!")));
     else
         return rv - 2;
 }
 #endif
 
 
-size_t Zstring::Replace(const defaultChar* old, const defaultChar* replacement, bool replaceAll)
+size_t Zstring::Replace(const DefaultChar* old, const DefaultChar* replacement, bool replaceAll)
 {
     const size_t oldLen         = defaultLength(old);
     const size_t replacementLen = defaultLength(replacement);
@@ -77,29 +77,29 @@ size_t Zstring::Replace(const defaultChar* old, const defaultChar* replacement,
 }
 
 
-bool matchesHelper(const defaultChar* string, const defaultChar* mask)
+bool matchesHelper(const DefaultChar* string, const DefaultChar* mask)
 {
-    for (defaultChar ch; (ch = *mask) != 0; ++mask)
+    for (DefaultChar ch; (ch = *mask) != 0; ++mask)
     {
         switch (ch)
         {
-        case defaultChar('?'):
+        case DefaultChar('?'):
             if (*string == 0)
                 return false;
             else
                 ++string;
             break;
 
-        case defaultChar('*'):
+        case DefaultChar('*'):
             //advance to next non-*/? char
             do
             {
                 ++mask;
                 ch = *mask;
             }
-            while (ch == defaultChar('*') || ch == defaultChar('?'));
+            while (ch == DefaultChar('*') || ch == DefaultChar('?'));
             //if match ends with '*':
-            if (ch == defaultChar(0))
+            if (ch == DefaultChar(0))
                 return true;
 
             ++mask;
@@ -123,7 +123,7 @@ bool matchesHelper(const defaultChar* string, const defaultChar* mask)
 }
 
 
-bool Zstring::Matches(const defaultChar* mask) const
+bool Zstring::Matches(const DefaultChar* mask) const
 {
     return matchesHelper(c_str(), mask);
 }
@@ -137,7 +137,7 @@ Zstring& Zstring::Trim(bool fromRight)
 
     if (fromRight)
     {
-        const defaultChar* cursor = data + thisLen - 1;
+        const DefaultChar* cursor = data + thisLen - 1;
         while (cursor != data - 1 && defaultIsWhiteSpace(*cursor)) //break when pointing one char further than last skipped element
             --cursor;
         ++cursor;
@@ -153,8 +153,8 @@ Zstring& Zstring::Trim(bool fromRight)
     }
     else
     {
-        defaultChar* cursor = data;
-        defaultChar ch;
+        DefaultChar* cursor = data;
+        DefaultChar ch;
         while ((ch = *cursor) != 0 && defaultIsWhiteSpace(ch))
             ++cursor;
 
@@ -185,7 +185,7 @@ Zstring& Zstring::MakeLower()
     if (descr->refCount > 1) //allocate new string
     {
         StringDescriptor* newDescr;
-        defaultChar*      newData;
+        DefaultChar*      newData;
         const size_t newCapacity = getCapacityToAllocate(thisLen);
         allocate(1, thisLen, newCapacity, newDescr, newData);
 
@@ -224,7 +224,7 @@ Zstring Zstring::substr(size_t pos, size_t len) const
 }
 
 
-size_t Zstring::rfind(const defaultChar ch, size_t pos) const
+size_t Zstring::rfind(const DefaultChar ch, size_t pos) const
 {
     const size_t thisLen = length();
     if (thisLen == 0)
@@ -245,7 +245,7 @@ size_t Zstring::rfind(const defaultChar ch, size_t pos) const
 }
 
 
-Zstring& Zstring::replace(size_t pos1, size_t n1, const defaultChar* str, size_t n2)
+Zstring& Zstring::replace(size_t pos1, size_t n1, const DefaultChar* str, size_t n2)
 {
     assert(str < c_str() || c_str() + length() < str); //str mustn't point to data in this string
     assert(n1 <= length() - pos1);
@@ -265,15 +265,15 @@ Zstring& Zstring::replace(size_t pos1, size_t n1, const defaultChar* str, size_t
             const size_t newCapacity = getCapacityToAllocate(newLen);
 
             StringDescriptor* newDescr;
-            defaultChar* newData;
+            DefaultChar* newData;
             allocate(1, newLen, newCapacity, newDescr, newData);
             //StringDescriptor* newDescr = new StringDescriptor(1, newLen, newCapacity);
-            //defaultChar* newData = new defaultChar[newCapacity + 1];
+            //DefaultChar* newData = new DefaultChar[newCapacity + 1];
 
             //assemble new string with replacement
-            memcpy(newData, data, pos1 * sizeof(defaultChar));
-            memcpy(newData + pos1, str, n2 * sizeof(defaultChar));
-            memcpy(newData + pos1 + n2, data + pos1 + n1, (oldLen - pos1 - n1) * sizeof(defaultChar));
+            memcpy(newData, data, pos1 * sizeof(DefaultChar));
+            memcpy(newData + pos1, str, n2 * sizeof(DefaultChar));
+            memcpy(newData + pos1 + n2, data + pos1 + n1, (oldLen - pos1 - n1) * sizeof(DefaultChar));
             newData[newLen] = 0;
 
             decRef();
@@ -282,10 +282,10 @@ Zstring& Zstring::replace(size_t pos1, size_t n1, const defaultChar* str, size_t
         }
         else
         {   //overwrite current string
-            memcpy(data + pos1, str, n2 * sizeof(defaultChar));
+            memcpy(data + pos1, str, n2 * sizeof(DefaultChar));
             if (n1 > n2)
             {
-                memmove(data + pos1 + n2, data + pos1 + n1, (oldLen - pos1 - n1) * sizeof(defaultChar));
+                memmove(data + pos1 + n2, data + pos1 + n1, (oldLen - pos1 - n1) * sizeof(DefaultChar));
                 data[newLen] = 0;
                 descr->length = newLen;
             }
@@ -295,7 +295,7 @@ Zstring& Zstring::replace(size_t pos1, size_t n1, const defaultChar* str, size_t
 }
 
 
-Zstring& Zstring::operator=(const defaultChar* source)
+Zstring& Zstring::operator=(const DefaultChar* source)
 {
     const size_t sourceLen = defaultLength(source);
     if (sourceLen == 0)
@@ -305,7 +305,7 @@ Zstring& Zstring::operator=(const defaultChar* source)
         *this = Zstring(source, sourceLen);
     else
     {   //overwrite this string
-        memcpy(data, source, sourceLen * sizeof(defaultChar));
+        memcpy(data, source, sourceLen * sizeof(DefaultChar));
         data[sourceLen] = 0;
         descr->length = sourceLen;
     }
@@ -322,7 +322,7 @@ Zstring& Zstring::operator+=(const Zstring& other)
         const size_t newLen = thisLen + otherLen;
         copyBeforeWrite(newLen);
 
-        memcpy(data + thisLen, other.c_str(), otherLen * sizeof(defaultChar));
+        memcpy(data + thisLen, other.c_str(), otherLen * sizeof(DefaultChar));
         data[newLen] = 0;
         descr->length = newLen;
     }
@@ -330,7 +330,7 @@ Zstring& Zstring::operator+=(const Zstring& other)
 }
 
 
-Zstring& Zstring::operator+=(const defaultChar* other)
+Zstring& Zstring::operator+=(const DefaultChar* other)
 {
     const size_t otherLen = defaultLength(other);
     if (otherLen != 0)
@@ -339,7 +339,7 @@ Zstring& Zstring::operator+=(const defaultChar* other)
         const size_t newLen = thisLen + otherLen;
         copyBeforeWrite(newLen);
 
-        memcpy(data + thisLen, other, otherLen * sizeof(defaultChar));
+        memcpy(data + thisLen, other, otherLen * sizeof(DefaultChar));
         data[newLen] = 0;
         descr->length = newLen;
     }
@@ -347,7 +347,7 @@ Zstring& Zstring::operator+=(const defaultChar* other)
 }
 
 
-Zstring& Zstring::operator+=(defaultChar ch)
+Zstring& Zstring::operator+=(DefaultChar ch)
 {
     const size_t oldLen = length();
     copyBeforeWrite(oldLen + 1);
@@ -368,15 +368,13 @@ void Zstring::copyBeforeWrite(const size_t capacityNeeded)
         const size_t newCapacity = getCapacityToAllocate(capacityNeeded);
 
         StringDescriptor* newDescr;
-        defaultChar* newData;
+        DefaultChar* newData;
         allocate(1, oldLength, newCapacity, newDescr, newData);
-        //StringDescriptor* newDescr = new StringDescriptor(1, oldLength, newCapacity);
-        //defaultChar* newData = new defaultChar[newCapacity + 1];
 
         if (oldLength)
         {
             assert(oldLength <= newCapacity);
-            memcpy(newData, data, oldLength * sizeof(defaultChar));
+            memcpy(newData, data, oldLength * sizeof(DefaultChar));
             newData[oldLength] = 0;
         }
         decRef();
@@ -387,10 +385,10 @@ void Zstring::copyBeforeWrite(const size_t capacityNeeded)
     {   //try to resize the current string (allocate anew if necessary)
         const size_t newCapacity = getCapacityToAllocate(capacityNeeded);
 
-        descr = (StringDescriptor*) realloc(descr, sizeof(StringDescriptor) + (newCapacity + 1) * sizeof(defaultChar));
+        descr = (StringDescriptor*) realloc(descr, sizeof(StringDescriptor) + (newCapacity + 1) * sizeof(DefaultChar));
         if (descr == NULL)
-            throw; //std::bad_alloc& e
-        data = (defaultChar*)(descr + 1);
+            throw std::bad_alloc();
+        data = (DefaultChar*)(descr + 1);
         descr->capacity = newCapacity;
     }
 }
diff --git a/library/zstring.h b/library/zstring.h
index 00590d4f..9013dd22 100644
--- a/library/zstring.h
+++ b/library/zstring.h
@@ -7,7 +7,8 @@
 #ifndef ZSTRING_H_INCLUDED
 #define ZSTRING_H_INCLUDED
 
-#include <wx/string.h>
+#include <string>
+
 
 namespace FreeFileSync
 {
@@ -18,6 +19,7 @@ namespace FreeFileSync
 #endif  //FFS_WIN
 }
 
+
 #ifdef FFS_WIN
 #define ZSTRING_WIDE_CHAR //use wide character strings
 
@@ -27,89 +29,93 @@ namespace FreeFileSync
 
 
 #ifdef ZSTRING_CHAR
-typedef char defaultChar;
+typedef char DefaultChar;
 #elif defined ZSTRING_WIDE_CHAR
-typedef wchar_t defaultChar;
+typedef wchar_t DefaultChar;
 #endif
 
+
 class Zstring
 {
 public:
     Zstring();
-    Zstring(const defaultChar* source);                //string is copied: O(length)
-    Zstring(const defaultChar* source, size_t length); //string is copied: O(length)
+    Zstring(const DefaultChar* source);                //string is copied: O(length)
+    Zstring(const DefaultChar* source, size_t length); //string is copied: O(length)
     Zstring(const Zstring& source);                    //reference-counting => O(1)
-    Zstring(const wxString& source);                   //string is copied: O(length)
     ~Zstring();
 
-    operator const defaultChar*() const;               //implicit conversion to C string
-    operator const wxString() const;                   //implicit conversion to wxString
+    operator const DefaultChar*() const;               //implicit conversion to C string
 
     //wxWidgets functions
-    bool StartsWith(const defaultChar* begin) const;
+    bool StartsWith(const DefaultChar* begin) const;
     bool StartsWith(const Zstring& begin) const;
-    bool EndsWith(const defaultChar* end) const;
+    bool EndsWith(const DefaultChar* end) const;
     bool EndsWith(const Zstring& end) const;
 #ifdef FFS_WIN
-    int CmpNoCase(const defaultChar* other) const;
+    int CmpNoCase(const DefaultChar* other) const;
     int CmpNoCase(const Zstring& other) const;
 #endif
-    int Cmp(const defaultChar* other) const;
+    int Cmp(const DefaultChar* other) const;
     int Cmp(const Zstring& other) const;
-    size_t Replace(const defaultChar* old, const defaultChar* replacement, bool replaceAll = true);
-    Zstring AfterLast(defaultChar ch) const;
-    Zstring BeforeLast(defaultChar ch) const;
-    size_t Find(defaultChar ch, bool fromEnd) const;
-    bool Matches(const defaultChar* mask) const;
+    size_t Replace(const DefaultChar* old, const DefaultChar* replacement, bool replaceAll = true);
+    Zstring AfterLast(DefaultChar ch) const;
+    Zstring BeforeLast(DefaultChar ch) const;
+    size_t Find(DefaultChar ch, bool fromEnd) const;
+    bool Matches(const DefaultChar* mask) const;
     Zstring& Trim(bool fromRight); //from right or left
     Zstring& MakeLower();
 
     //std::string functions
     size_t length() const;
-    const defaultChar* c_str() const;
+    const DefaultChar* c_str() const;
     Zstring substr(size_t pos = 0, size_t len = npos) const;
     bool empty() const;
-    int compare(const defaultChar* other) const;
+    int compare(const DefaultChar* other) const;
     int compare(const Zstring& other) const;
-    int compare(const size_t pos1, const size_t n1, const defaultChar* other) const;
-    size_t find(const defaultChar* str, const size_t pos = 0 ) const;
-    size_t find(const defaultChar ch, const size_t pos = 0) const;
-    size_t rfind(const defaultChar ch, size_t pos = npos) const;
-    Zstring& replace(size_t pos1, size_t n1, const defaultChar* str, size_t n2);
+    int compare(const size_t pos1, const size_t n1, const DefaultChar* other) const;
+    size_t find(const DefaultChar* str, const size_t pos = 0 ) const;
+    size_t find(const DefaultChar ch, const size_t pos = 0) const;
+    size_t rfind(const DefaultChar ch, size_t pos = npos) const;
+    Zstring& replace(size_t pos1, size_t n1, const DefaultChar* str, size_t n2);
+    size_t size() const;
 
     Zstring& operator=(const Zstring& source);
-    Zstring& operator=(const defaultChar* source);
+    Zstring& operator=(const DefaultChar* source);
 
     bool operator==(const Zstring& other) const;
-    bool operator==(const defaultChar* other) const;
+    bool operator==(const DefaultChar* other) const;
+    bool operator!=(const Zstring& other) const;
+    bool operator!=(const DefaultChar* other) const;
+
+    DefaultChar operator[](const size_t pos) const;
 
     Zstring& operator+=(const Zstring& other);
-    Zstring& operator+=(const defaultChar* other);
-    Zstring& operator+=(defaultChar ch);
+    Zstring& operator+=(const DefaultChar* other);
+    Zstring& operator+=(DefaultChar ch);
 
     Zstring operator+(const Zstring& string2) const;
-    Zstring operator+(const defaultChar* string2) const;
-    Zstring operator+(const defaultChar ch) const;
+    Zstring operator+(const DefaultChar* string2) const;
+    Zstring operator+(const DefaultChar ch) const;
 
     static const size_t	npos = static_cast<size_t>(-1);
 
 private:
-    void initAndCopy(const defaultChar* source, size_t length);
-    void incRef();                                     //support for reference-counting
+    void initAndCopy(const DefaultChar* source, size_t length);
+    void incRef() const;                               //support for reference-counting
     void decRef();                                     //
     void copyBeforeWrite(const size_t capacityNeeded); //and copy-on-write
 
     struct StringDescriptor
     {
         StringDescriptor(const unsigned int refC, const size_t len, const size_t cap) : refCount(refC), length(len), capacity(cap) {}
-        unsigned int refCount;
+        mutable unsigned int refCount;
         size_t       length;
         size_t       capacity; //allocated length without null-termination
     };
-    static void allocate(const unsigned int newRefCount, const size_t newLength, const size_t newCapacity, Zstring::StringDescriptor*& newDescr, defaultChar*& newData);
+    static void allocate(const unsigned int newRefCount, const size_t newLength, const size_t newCapacity, Zstring::StringDescriptor*& newDescr, DefaultChar*& newData);
 
     StringDescriptor* descr;
-    defaultChar*      data;
+    DefaultChar*      data;
 };
 
 
@@ -151,13 +157,13 @@ inline
 bool defaultIsWhiteSpace(const char ch)
 {
     // some compilers (e.g. VC++ 6.0) return true for a call to isspace('\xEA') => exclude char(128) to char(255)
-    return (ch < 128) && isspace(ch) != 0;
+    return ((unsigned char)ch < 128) && isspace((unsigned char)ch) != 0;
 }
 
 inline
 char defaultToLower(const char ch)
 {
-    return tolower(ch);
+    return tolower((unsigned char)ch); //caution: although tolower() has int as input parameter it expects unsigned chars!
 }
 
 #elif defined ZSTRING_WIDE_CHAR
@@ -217,20 +223,20 @@ void Zstring::allocate(const unsigned int newRefCount,
                        const size_t       newLength,
                        const size_t       newCapacity,
                        StringDescriptor*& newDescr,
-                       defaultChar*&      newData)
+                       DefaultChar*&      newData)
 {   //allocate and set data for new string
     if (newCapacity)
     {
-        newDescr = (StringDescriptor*) malloc( sizeof(StringDescriptor) + (newCapacity + 1) * sizeof(defaultChar));
+        newDescr = (StringDescriptor*) malloc( sizeof(StringDescriptor) + (newCapacity + 1) * sizeof(DefaultChar));
         if (newDescr == NULL)
-            throw; //std::bad_alloc& e
-        newData = (defaultChar*)(newDescr + 1);
+            throw std::bad_alloc();
+        newData = (DefaultChar*)(newDescr + 1);
     }
     else
     {
         newDescr = (StringDescriptor*) malloc( sizeof(StringDescriptor));
         if (newDescr == NULL)
-            throw; //std::bad_alloc& e
+            throw std::bad_alloc();
         newData = NULL;
     }
 
@@ -259,14 +265,14 @@ Zstring::Zstring()
 
 
 inline
-Zstring::Zstring(const defaultChar* source)
+Zstring::Zstring(const DefaultChar* source)
 {
     initAndCopy(source, defaultLength(source));
 }
 
 
 inline
-Zstring::Zstring(const defaultChar* source, size_t length)
+Zstring::Zstring(const DefaultChar* source, size_t length)
 {
     initAndCopy(source, length);
 }
@@ -282,13 +288,6 @@ Zstring::Zstring(const Zstring& source)
 
 
 inline
-Zstring::Zstring(const wxString& source)
-{
-    initAndCopy(source.c_str(), source.length());
-}
-
-
-inline
 Zstring::~Zstring()
 {
     decRef();
@@ -303,17 +302,17 @@ size_t getCapacityToAllocate(const size_t length)
 
 
 inline
-void Zstring::initAndCopy(const defaultChar* source, size_t length)
+void Zstring::initAndCopy(const DefaultChar* source, size_t length)
 {
     const size_t newCapacity = getCapacityToAllocate(length);
     allocate(1, length, newCapacity, descr, data);
-    memcpy(data, source, length * sizeof(defaultChar));
+    memcpy(data, source, length * sizeof(DefaultChar));
     data[length] = 0;
 }
 
 
 inline
-void Zstring::incRef()
+void Zstring::incRef() const
 {
     assert(descr);
     ++descr->refCount;
@@ -337,7 +336,7 @@ void Zstring::decRef()
 
 #ifdef FFS_WIN
 inline
-int Zstring::CmpNoCase(const defaultChar* other) const
+int Zstring::CmpNoCase(const DefaultChar* other) const
 {
     return FreeFileSync::compareStringsWin32(c_str(), other); //way faster than wxString::CmpNoCase()!!
 }
@@ -352,7 +351,7 @@ int Zstring::CmpNoCase(const Zstring& other) const
 
 
 inline
-Zstring::operator const defaultChar*() const
+Zstring::operator const DefaultChar*() const
 {
     return c_str();
 }
@@ -361,19 +360,17 @@ Zstring::operator const defaultChar*() const
 inline
 Zstring& Zstring::operator=(const Zstring& source)
 {
-    if (this != &source)
-    {
-        decRef();
-        descr = source.descr;
-        data  = source.data;
-        incRef();
-    }
+    source.incRef(); //implicitly handle case "this == &source" and avoid this check
+    decRef();        //
+    descr = source.descr;
+    data  = source.data;
+
     return *this;
 }
 
 
 inline
-size_t Zstring::Find(defaultChar ch, bool fromEnd) const
+size_t Zstring::Find(DefaultChar ch, bool fromEnd) const
 {
     if (fromEnd)
         return rfind(ch, npos);
@@ -385,7 +382,7 @@ size_t Zstring::Find(defaultChar ch, bool fromEnd) const
 // get all characters after the last occurence of ch
 // (returns the whole string if ch not found)
 inline
-Zstring Zstring::AfterLast(defaultChar ch) const
+Zstring Zstring::AfterLast(DefaultChar ch) const
 {
     size_t pos = rfind(ch, npos);
     if (pos == npos )
@@ -398,7 +395,7 @@ Zstring Zstring::AfterLast(defaultChar ch) const
 // get all characters before the last occurence of ch
 // (returns empty string if ch not found)
 inline
-Zstring Zstring::BeforeLast(defaultChar ch) const
+Zstring Zstring::BeforeLast(DefaultChar ch) const
 {
     size_t pos = rfind(ch, npos);
 
@@ -410,7 +407,7 @@ Zstring Zstring::BeforeLast(defaultChar ch) const
 
 
 inline
-bool Zstring::StartsWith(const defaultChar* begin) const
+bool Zstring::StartsWith(const DefaultChar* begin) const
 {
     const size_t beginLength = defaultLength(begin);
     if (length() < beginLength)
@@ -430,7 +427,7 @@ bool Zstring::StartsWith(const Zstring& begin) const
 
 
 inline
-bool Zstring::EndsWith(const defaultChar* end) const
+bool Zstring::EndsWith(const DefaultChar* end) const
 {
     const size_t thisLength = length();
     const size_t endLength  = defaultLength(end);
@@ -452,57 +449,64 @@ bool Zstring::EndsWith(const Zstring& end) const
 
 
 inline
-size_t Zstring::find(const defaultChar* str, const size_t pos) const
+size_t Zstring::find(const DefaultChar* str, const size_t pos) const
 {
     assert(pos <= length());
-    const defaultChar* thisStr = c_str();
-    const defaultChar* found = defaultStrFind(thisStr + pos, str);
+    const DefaultChar* thisStr = c_str();
+    const DefaultChar* found = defaultStrFind(thisStr + pos, str);
     return found == NULL ? npos : found - thisStr;
 }
 
 
 inline
-size_t Zstring::find(const defaultChar ch, const size_t pos) const
+size_t Zstring::find(const DefaultChar ch, const size_t pos) const
 {
     assert(pos <= length());
-    const defaultChar* thisStr = c_str();
-    const defaultChar* found = defaultStrFind(thisStr + pos, ch);
+    const DefaultChar* thisStr = c_str();
+    const DefaultChar* found = defaultStrFind(thisStr + pos, ch);
     return found == NULL ? npos : found - thisStr;
 }
 
 
 inline
-Zstring::operator const wxString() const
+int Zstring::Cmp(const DefaultChar* other) const
 {
-    return wxString(c_str());
+    return compare(other);
 }
 
 
 inline
-int Zstring::Cmp(const defaultChar* other) const
+int Zstring::Cmp(const Zstring& other) const
 {
-    return compare(other);
+    return defaultCompare(c_str(), other.c_str()); //overload using strcmp(char*, char*) should be fastest!
 }
 
 
 inline
-int Zstring::Cmp(const Zstring& other) const
+bool Zstring::operator==(const Zstring& other) const
 {
-    return defaultCompare(c_str(), other.c_str()); //overload using strcmp(char*, char*) should be fastest!
+    return length() != other.length() ? false : defaultCompare(c_str(), other.c_str()) == 0;
 }
 
 
 inline
-bool Zstring::operator==(const Zstring& other) const
+bool Zstring::operator==(const DefaultChar* other) const
 {
-    return defaultCompare(c_str(), other.c_str()) == 0; //overload using strcmp(char*, char*) should be fastest!
+    return defaultCompare(c_str(), other) == 0; //overload using strcmp(char*, char*) should be fastest!
 }
 
 
 inline
-bool Zstring::operator==(const defaultChar* other) const
+bool Zstring::operator!=(const Zstring& other) const
 {
-    return compare(other) == 0;
+    return length() != other.length() ? true: defaultCompare(c_str(), other.c_str()) != 0;
+}
+
+
+inline
+bool Zstring::operator!=(const DefaultChar* other) const
+{
+    return defaultCompare(c_str(), other) != 0; //overload using strcmp(char*, char*) should be fastest!
 }
 
 
@@ -514,14 +518,14 @@ int Zstring::compare(const Zstring& other) const
 
 
 inline
-int Zstring::compare(const defaultChar* other) const
+int Zstring::compare(const DefaultChar* other) const
 {
     return defaultCompare(c_str(), other); //overload using strcmp(char*, char*) should be fastest!
 }
 
 
 inline
-int Zstring::compare(const size_t pos1, const size_t n1, const defaultChar* other) const
+int Zstring::compare(const size_t pos1, const size_t n1, const DefaultChar* other) const
 {
     assert(length() - pos1 >= n1);
     return defaultCompare(c_str() + pos1, other, n1);
@@ -536,7 +540,14 @@ size_t Zstring::length() const
 
 
 inline
-const defaultChar* Zstring::c_str() const
+size_t Zstring::size() const
+{
+    return descr->length;
+}
+
+
+inline
+const DefaultChar* Zstring::c_str() const
 {
     if (length())
         return data;
@@ -557,6 +568,14 @@ bool Zstring::empty() const
 
 
 inline
+DefaultChar Zstring::operator[](const size_t pos) const
+{
+    assert(pos < length());
+    return data[pos];
+}
+
+
+inline
 Zstring Zstring::operator+(const Zstring& string2) const
 {
     return Zstring(*this)+=string2;
@@ -564,14 +583,14 @@ Zstring Zstring::operator+(const Zstring& string2) const
 
 
 inline
-Zstring Zstring::operator+(const defaultChar* string2) const
+Zstring Zstring::operator+(const DefaultChar* string2) const
 {
     return Zstring(*this)+=string2;
 }
 
 
 inline
-Zstring Zstring::operator+(const defaultChar ch) const
+Zstring Zstring::operator+(const DefaultChar ch) const
 {
     return Zstring(*this)+=ch;
 }