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Don't use GetThreadId() in wxMSW code.
[wxWidgets.git] / samples / dataview / dataview.cpp
diff --git a/samples/dataview/dataview.cpp b/samples/dataview/dataview.cpp
index dccee4f9e8b3bdca8623a1f6d272e6fa7d77897d..857992884d39d4e6060bf2c970d2b6ec82d3d720 100644 (file)
--- a/samples/dataview/dataview.cpp
+++ b/samples/dataview/dataview.cpp
@@ -6,7 +6,7 @@
 // Created:     06/01/06
 // RCS-ID:      $Id$
 // Copyright:   (c) Robert Roebling
 // Created:     06/01/06
 // RCS-ID:      $Id$
 // Copyright:   (c) Robert Roebling
-// Licence:     wxWindows license
+// Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // ============================================================================
 /////////////////////////////////////////////////////////////////////////////
 
 // ============================================================================
@@ -41,7 +41,7 @@
 // resources
 // ----------------------------------------------------------------------------
 
 // resources
 // ----------------------------------------------------------------------------
 
-#ifndef __WXMSW__
+#ifndef wxHAS_IMAGES_IN_RESOURCES
     #include "../sample.xpm"
 #endif
 
     #include "../sample.xpm"
 #endif
 
@@ -71,8 +71,8 @@ public:
                            unsigned int nPanel,
                            unsigned long style = 0);
 
                            unsigned int nPanel,
                            unsigned long style = 0);
 
-public:     // event handlers
-
+private:
+    // event handlers
     void OnStyleChange(wxCommandEvent& event);
     void OnSetBackgroundColour(wxCommandEvent& event);
     void OnSetForegroundColour(wxCommandEvent& event);
     void OnStyleChange(wxCommandEvent& event);
     void OnSetBackgroundColour(wxCommandEvent& event);
     void OnSetForegroundColour(wxCommandEvent& event);
@@ -83,14 +83,21 @@ public:     // event handlers
     void OnPageChanged(wxBookCtrlEvent& event);
 
     void OnAddMozart(wxCommandEvent& event);
     void OnPageChanged(wxBookCtrlEvent& event);
 
     void OnAddMozart(wxCommandEvent& event);
-    void OnDeleteMusic(wxCommandEvent& event);
+    void OnDeleteSelected(wxCommandEvent& event);
     void OnDeleteYear(wxCommandEvent& event);
     void OnSelectNinth(wxCommandEvent& event);
     void OnCollapse(wxCommandEvent& event);
     void OnExpand(wxCommandEvent& event);
     void OnDeleteYear(wxCommandEvent& event);
     void OnSelectNinth(wxCommandEvent& event);
     void OnCollapse(wxCommandEvent& event);
     void OnExpand(wxCommandEvent& event);
+    void OnShowCurrent(wxCommandEvent& event);
+    void OnSetNinthCurrent(wxCommandEvent& event);
 
     void OnPrependList(wxCommandEvent& event);
     void OnDeleteList(wxCommandEvent& event);
 
     void OnPrependList(wxCommandEvent& event);
     void OnDeleteList(wxCommandEvent& event);
+    // Fourth page.
+    void OnDeleteTreeItem(wxCommandEvent& event);
+    void OnDeleteAllTreeItems(wxCommandEvent& event);
+    void OnAddTreeItem(wxCommandEvent& event);
+    void OnAddTreeContainerItem(wxCommandEvent& event);
 
     void OnValueChanged( wxDataViewEvent &event );
 
 
     void OnValueChanged( wxDataViewEvent &event );
 
@@ -106,20 +113,29 @@ public:     // event handlers
     void OnEditingDone( wxDataViewEvent &event );
 
     void OnHeaderClick( wxDataViewEvent &event );
     void OnEditingDone( wxDataViewEvent &event );
 
     void OnHeaderClick( wxDataViewEvent &event );
+    void OnAttrHeaderClick( wxDataViewEvent &event );
     void OnHeaderRightClick( wxDataViewEvent &event );
     void OnSorted( wxDataViewEvent &event );
 
     void OnContextMenu( wxDataViewEvent &event );
 
     void OnHeaderRightClick( wxDataViewEvent &event );
     void OnSorted( wxDataViewEvent &event );
 
     void OnContextMenu( wxDataViewEvent &event );
 
-    void OnRightClick( wxMouseEvent &event );
     void OnGoto( wxCommandEvent &event);
     void OnAddMany( wxCommandEvent &event);
     void OnGoto( wxCommandEvent &event);
     void OnAddMany( wxCommandEvent &event);
+    void OnHideAttributes( wxCommandEvent &event);
+    void OnShowAttributes( wxCommandEvent &event);
 
 
+#if wxUSE_DRAG_AND_DROP
     void OnBeginDrag( wxDataViewEvent &event );
     void OnDropPossible( wxDataViewEvent &event );
     void OnDrop( wxDataViewEvent &event );
     void OnBeginDrag( wxDataViewEvent &event );
     void OnDropPossible( wxDataViewEvent &event );
     void OnDrop( wxDataViewEvent &event );
+#endif // wxUSE_DRAG_AND_DROP
+
+    void OnDataViewChar(wxKeyEvent& event);
+
+    // helper used by both OnDeleteSelected() and OnDataViewChar()
+    void DeleteSelectedItems();
+
 
 
-private:
     wxNotebook* m_notebook;
 
     // the controls stored in the various tabs of the main notebook:
     wxNotebook* m_notebook;
 
     // the controls stored in the various tabs of the main notebook:
@@ -134,6 +150,7 @@ private:
     // other data:
 
     wxDataViewColumn* m_col;
     // other data:
 
     wxDataViewColumn* m_col;
+    wxDataViewColumn* m_attributes;
 
     wxTextCtrl* m_log;
     wxLog *m_logOld;
 
     wxTextCtrl* m_log;
     wxLog *m_logOld;
@@ -150,52 +167,58 @@ private:
 class MyCustomRenderer: public wxDataViewCustomRenderer
 {
 public:
 class MyCustomRenderer: public wxDataViewCustomRenderer
 {
 public:
-    MyCustomRenderer( wxDataViewCellMode mode, int alignment ) :
-       wxDataViewCustomRenderer( wxString("long"), mode, alignment )
-       { m_height = 25; }
+    MyCustomRenderer()
+        : wxDataViewCustomRenderer("string",
+                                   wxDATAVIEW_CELL_ACTIVATABLE,
+                                   wxALIGN_CENTER)
+       { }
 
 
-    virtual bool Render( wxRect rect, wxDC *dc, int WXUNUSED(state) )
+    virtual bool Render( wxRect rect, wxDC *dc, int state )
     {
     {
-        dc->SetBrush( *wxRED_BRUSH );
+        dc->SetBrush( *wxLIGHT_GREY_BRUSH );
         dc->SetPen( *wxTRANSPARENT_PEN );
         dc->SetPen( *wxTRANSPARENT_PEN );
-        dc->DrawRectangle( rect.Deflate(2) );
-        return true;
-    }
 
 
-    virtual bool Activate( wxRect WXUNUSED(cell),
-                           wxDataViewModel *WXUNUSED(model),
-                           const wxDataViewItem &WXUNUSED(item),
-                           unsigned int WXUNUSED(col) )
-    {
-        wxLogMessage( "MyCustomRenderer Activate()" );
-        return false;
+        rect.Deflate(2);
+        dc->DrawRoundedRectangle( rect, 5 );
+
+        RenderText(m_value,
+                   0, // no offset
+                   wxRect(dc->GetTextExtent(m_value)).CentreIn(rect),
+                   dc,
+                   state);
+        return true;
     }
 
     }
 
-    virtual bool LeftClick( wxPoint cursor, wxRect WXUNUSED(cell),
-                           wxDataViewModel *WXUNUSED(model),
-                           const wxDataViewItem &WXUNUSED(item),
-                           unsigned int WXUNUSED(col) )
+    virtual bool ActivateCell(const wxRect& WXUNUSED(cell),
+                              wxDataViewModel *WXUNUSED(model),
+                              const wxDataViewItem &WXUNUSED(item),
+                              unsigned int WXUNUSED(col),
+                              const wxMouseEvent *mouseEvent)
     {
     {
-        wxLogMessage( "MyCustomRenderer LeftClick( %d, %d )", cursor.x, cursor.y );
+        wxString position;
+        if ( mouseEvent )
+            position = wxString::Format("via mouse at %d, %d", mouseEvent->m_x, mouseEvent->m_y);
+        else
+            position = "from keyboard";
+        wxLogMessage("MyCustomRenderer ActivateCell() %s", position);
         return false;
     }
 
     virtual wxSize GetSize() const
     {
         return false;
     }
 
     virtual wxSize GetSize() const
     {
-        //return wxSize(60,m_height);
         return wxSize(60,20);
     }
 
     virtual bool SetValue( const wxVariant &value )
     {
         return wxSize(60,20);
     }
 
     virtual bool SetValue( const wxVariant &value )
     {
-        m_height = value;
+        m_value = value.GetString();
         return true;
     }
 
     virtual bool GetValue( wxVariant &WXUNUSED(value) ) const { return true; }
 
 private:
         return true;
     }
 
     virtual bool GetValue( wxVariant &WXUNUSED(value) ) const { return true; }
 
 private:
-    long m_height;
+    wxString m_value;
 };
 
 
 };
 
 
@@ -216,7 +239,6 @@ bool MyApp::OnInit()
 
     MyFrame *frame =
         new MyFrame(NULL, "wxDataViewCtrl sample", 40, 40, 1000, 540);
 
     MyFrame *frame =
         new MyFrame(NULL, "wxDataViewCtrl sample", 40, 40, 1000, 540);
-    SetTopWindow(frame);
 
     frame->Show(true);
     return true;
 
     frame->Show(true);
     return true;
@@ -250,18 +272,29 @@ enum
     // control IDs
 
     ID_MUSIC_CTRL       = 50,
     // control IDs
 
     ID_MUSIC_CTRL       = 50,
+    ID_ATTR_CTRL        = 51,
 
     ID_ADD_MOZART       = 100,
 
     ID_ADD_MOZART       = 100,
-    ID_DELETE_MUSIC     = 101,
+    ID_DELETE_SEL       = 101,
     ID_DELETE_YEAR      = 102,
     ID_SELECT_NINTH     = 103,
     ID_COLLAPSE         = 104,
     ID_EXPAND           = 105,
     ID_DELETE_YEAR      = 102,
     ID_SELECT_NINTH     = 103,
     ID_COLLAPSE         = 104,
     ID_EXPAND           = 105,
+    ID_SHOW_CURRENT,
+    ID_SET_NINTH_CURRENT,
 
     ID_PREPEND_LIST     = 200,
     ID_DELETE_LIST      = 201,
     ID_GOTO             = 202,
 
     ID_PREPEND_LIST     = 200,
     ID_DELETE_LIST      = 201,
     ID_GOTO             = 202,
-    ID_ADD_MANY         = 203
+    ID_ADD_MANY         = 203,
+    ID_HIDE_ATTRIBUTES  = 204,
+    ID_SHOW_ATTRIBUTES  = 205,
+
+    // Fourth page.
+    ID_DELETE_TREE_ITEM = 400,
+    ID_DELETE_ALL_TREE_ITEMS = 401,
+    ID_ADD_TREE_ITEM = 402,
+    ID_ADD_TREE_CONTAINER_ITEM = 403
 };
 
 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 };
 
 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
@@ -276,16 +309,25 @@ BEGIN_EVENT_TABLE(MyFrame, wxFrame)
     EVT_NOTEBOOK_PAGE_CHANGED( wxID_ANY, MyFrame::OnPageChanged )
 
     EVT_BUTTON( ID_ADD_MOZART, MyFrame::OnAddMozart )
     EVT_NOTEBOOK_PAGE_CHANGED( wxID_ANY, MyFrame::OnPageChanged )
 
     EVT_BUTTON( ID_ADD_MOZART, MyFrame::OnAddMozart )
-    EVT_BUTTON( ID_DELETE_MUSIC, MyFrame::OnDeleteMusic )
+    EVT_BUTTON( ID_DELETE_SEL, MyFrame::OnDeleteSelected )
     EVT_BUTTON( ID_DELETE_YEAR, MyFrame::OnDeleteYear )
     EVT_BUTTON( ID_SELECT_NINTH, MyFrame::OnSelectNinth )
     EVT_BUTTON( ID_COLLAPSE, MyFrame::OnCollapse )
     EVT_BUTTON( ID_EXPAND, MyFrame::OnExpand )
     EVT_BUTTON( ID_DELETE_YEAR, MyFrame::OnDeleteYear )
     EVT_BUTTON( ID_SELECT_NINTH, MyFrame::OnSelectNinth )
     EVT_BUTTON( ID_COLLAPSE, MyFrame::OnCollapse )
     EVT_BUTTON( ID_EXPAND, MyFrame::OnExpand )
+    EVT_BUTTON( ID_SHOW_CURRENT, MyFrame::OnShowCurrent )
+    EVT_BUTTON( ID_SET_NINTH_CURRENT, MyFrame::OnSetNinthCurrent )
 
     EVT_BUTTON( ID_PREPEND_LIST, MyFrame::OnPrependList )
     EVT_BUTTON( ID_DELETE_LIST, MyFrame::OnDeleteList )
     EVT_BUTTON( ID_GOTO, MyFrame::OnGoto)
     EVT_BUTTON( ID_ADD_MANY, MyFrame::OnAddMany)
 
     EVT_BUTTON( ID_PREPEND_LIST, MyFrame::OnPrependList )
     EVT_BUTTON( ID_DELETE_LIST, MyFrame::OnDeleteList )
     EVT_BUTTON( ID_GOTO, MyFrame::OnGoto)
     EVT_BUTTON( ID_ADD_MANY, MyFrame::OnAddMany)
+    EVT_BUTTON( ID_HIDE_ATTRIBUTES, MyFrame::OnHideAttributes)
+    EVT_BUTTON( ID_SHOW_ATTRIBUTES, MyFrame::OnShowAttributes)
+    // Fourth page.
+    EVT_BUTTON( ID_DELETE_TREE_ITEM, MyFrame::OnDeleteTreeItem )
+    EVT_BUTTON( ID_DELETE_ALL_TREE_ITEMS, MyFrame::OnDeleteAllTreeItems )
+    EVT_BUTTON( ID_ADD_TREE_ITEM, MyFrame::OnAddTreeItem )
+    EVT_BUTTON( ID_ADD_TREE_CONTAINER_ITEM, MyFrame::OnAddTreeContainerItem )
 
     EVT_DATAVIEW_ITEM_VALUE_CHANGED( ID_MUSIC_CTRL, MyFrame::OnValueChanged )
 
 
     EVT_DATAVIEW_ITEM_VALUE_CHANGED( ID_MUSIC_CTRL, MyFrame::OnValueChanged )
 
@@ -306,11 +348,14 @@ BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 
     EVT_DATAVIEW_ITEM_CONTEXT_MENU(ID_MUSIC_CTRL, MyFrame::OnContextMenu)
 
 
     EVT_DATAVIEW_ITEM_CONTEXT_MENU(ID_MUSIC_CTRL, MyFrame::OnContextMenu)
 
+#if wxUSE_DRAG_AND_DROP
     EVT_DATAVIEW_ITEM_BEGIN_DRAG( ID_MUSIC_CTRL, MyFrame::OnBeginDrag )
     EVT_DATAVIEW_ITEM_DROP_POSSIBLE( ID_MUSIC_CTRL, MyFrame::OnDropPossible )
     EVT_DATAVIEW_ITEM_DROP( ID_MUSIC_CTRL, MyFrame::OnDrop )
     EVT_DATAVIEW_ITEM_BEGIN_DRAG( ID_MUSIC_CTRL, MyFrame::OnBeginDrag )
     EVT_DATAVIEW_ITEM_DROP_POSSIBLE( ID_MUSIC_CTRL, MyFrame::OnDropPossible )
     EVT_DATAVIEW_ITEM_DROP( ID_MUSIC_CTRL, MyFrame::OnDrop )
+#endif // wxUSE_DRAG_AND_DROP
+
+    EVT_DATAVIEW_COLUMN_HEADER_CLICK(ID_ATTR_CTRL, MyFrame::OnAttrHeaderClick)
 
 
-    EVT_RIGHT_UP(MyFrame::OnRightClick)
 END_EVENT_TABLE()
 
 MyFrame::MyFrame(wxFrame *frame, const wxString &title, int x, int y, int w, int h):
 END_EVENT_TABLE()
 
 MyFrame::MyFrame(wxFrame *frame, const wxString &title, int x, int y, int w, int h):
@@ -339,7 +384,7 @@ MyFrame::MyFrame(wxFrame *frame, const wxString &title, int x, int y, int w, int
 
     wxMenu *file_menu = new wxMenu;
     file_menu->Append(ID_CLEARLOG, "&Clear log\tCtrl-L");
 
     wxMenu *file_menu = new wxMenu;
     file_menu->Append(ID_CLEARLOG, "&Clear log\tCtrl-L");
-    file_menu->Append(ID_FOREGROUND_COLOUR, "Set &foreground colour...\tCtrl-F");
+    file_menu->Append(ID_FOREGROUND_COLOUR, "Set &foreground colour...\tCtrl-S");
     file_menu->Append(ID_BACKGROUND_COLOUR, "Set &background colour...\tCtrl-B");
     file_menu->Append(ID_STYLE_MENU, "&Style", style_menu);
     file_menu->AppendSeparator();
     file_menu->Append(ID_BACKGROUND_COLOUR, "Set &background colour...\tCtrl-B");
     file_menu->Append(ID_STYLE_MENU, "&Style", style_menu);
     file_menu->AppendSeparator();
@@ -356,6 +401,14 @@ MyFrame::MyFrame(wxFrame *frame, const wxString &title, int x, int y, int w, int
     CreateStatusBar();
 
 
     CreateStatusBar();
 
 
+    // redirect logs from our event handlers to text control
+    m_log = new wxTextCtrl( this, wxID_ANY, wxString(), wxDefaultPosition,
+                            wxDefaultSize, wxTE_MULTILINE );
+    m_log->SetMinSize(wxSize(-1, 100));
+    m_logOld = wxLog::SetActiveTarget(new wxLogTextCtrl(m_log));
+    wxLogMessage( "This is the log window" );
+
+
     // first page of the notebook
     // --------------------------
 
     // first page of the notebook
     // --------------------------
 
@@ -365,13 +418,21 @@ MyFrame::MyFrame(wxFrame *frame, const wxString &title, int x, int y, int w, int
 
     BuildDataViewCtrl(firstPanel, 0);    // sets m_ctrl[0]
 
 
     BuildDataViewCtrl(firstPanel, 0);    // sets m_ctrl[0]
 
+    const wxSizerFlags border = wxSizerFlags().DoubleBorder();
+
     wxBoxSizer *button_sizer = new wxBoxSizer( wxHORIZONTAL );
     wxBoxSizer *button_sizer = new wxBoxSizer( wxHORIZONTAL );
-    button_sizer->Add( new wxButton( firstPanel, ID_ADD_MOZART,  "Add Mozart"),             0, wxALL, 10 );
-    button_sizer->Add( new wxButton( firstPanel, ID_DELETE_MUSIC,"Delete selected"),        0, wxALL, 10 );
-    button_sizer->Add( new wxButton( firstPanel, ID_DELETE_YEAR, "Delete \"Year\" column"), 0, wxALL, 10 );
-    button_sizer->Add( new wxButton( firstPanel, ID_SELECT_NINTH,"Select ninth symphony"),  0, wxALL, 10 );
-    button_sizer->Add( new wxButton( firstPanel, ID_COLLAPSE,    "Collapse"),               0, wxALL, 10 );
-    button_sizer->Add( new wxButton( firstPanel, ID_EXPAND,      "Expand"),                 0, wxALL, 10 );
+    button_sizer->Add( new wxButton( firstPanel, ID_ADD_MOZART,  "Add Mozart"),             border );
+    button_sizer->Add( new wxButton( firstPanel, ID_DELETE_SEL,  "Delete selected"),        border );
+    button_sizer->Add( new wxButton( firstPanel, ID_DELETE_YEAR, "Delete \"Year\" column"), border );
+    button_sizer->Add( new wxButton( firstPanel, ID_SELECT_NINTH,"Select ninth symphony"),  border );
+    button_sizer->Add( new wxButton( firstPanel, ID_COLLAPSE,    "Collapse"),               border );
+    button_sizer->Add( new wxButton( firstPanel, ID_EXPAND,      "Expand"),                 border );
+
+    wxBoxSizer *sizerCurrent = new wxBoxSizer(wxHORIZONTAL);
+    sizerCurrent->Add(new wxButton(firstPanel, ID_SHOW_CURRENT,
+                                   "&Show current"), border);
+    sizerCurrent->Add(new wxButton(firstPanel, ID_SET_NINTH_CURRENT,
+                                   "Make &ninth symphony current"), border);
 
     wxSizer *firstPanelSz = new wxBoxSizer( wxVERTICAL );
     m_ctrl[0]->SetMinSize(wxSize(-1, 200));
 
     wxSizer *firstPanelSz = new wxBoxSizer( wxVERTICAL );
     m_ctrl[0]->SetMinSize(wxSize(-1, 200));
@@ -380,6 +441,7 @@ MyFrame::MyFrame(wxFrame *frame, const wxString &title, int x, int y, int w, int
         new wxStaticText(firstPanel, wxID_ANY, "Most of the cells above are editable!"),
         0, wxGROW|wxALL, 5);
     firstPanelSz->Add(button_sizer);
         new wxStaticText(firstPanel, wxID_ANY, "Most of the cells above are editable!"),
         0, wxGROW|wxALL, 5);
     firstPanelSz->Add(button_sizer);
+    firstPanelSz->Add(sizerCurrent);
     firstPanel->SetSizerAndFit(firstPanelSz);
 
 
     firstPanel->SetSizerAndFit(firstPanelSz);
 
 
@@ -391,10 +453,12 @@ MyFrame::MyFrame(wxFrame *frame, const wxString &title, int x, int y, int w, int
     BuildDataViewCtrl(secondPanel, 1);    // sets m_ctrl[1]
 
     wxBoxSizer *button_sizer2 = new wxBoxSizer( wxHORIZONTAL );
     BuildDataViewCtrl(secondPanel, 1);    // sets m_ctrl[1]
 
     wxBoxSizer *button_sizer2 = new wxBoxSizer( wxHORIZONTAL );
-    button_sizer2->Add( new wxButton( secondPanel, ID_PREPEND_LIST,"Prepend"),         0, wxALL, 10 );
-    button_sizer2->Add( new wxButton( secondPanel, ID_DELETE_LIST, "Delete selected"), 0, wxALL, 10 );
-    button_sizer2->Add( new wxButton( secondPanel, ID_GOTO,        "Goto 50"),         0, wxALL, 10 );
-    button_sizer2->Add( new wxButton( secondPanel, ID_ADD_MANY,    "Add 1000"),        0, wxALL, 10 );
+    button_sizer2->Add( new wxButton( secondPanel, ID_PREPEND_LIST,"Prepend"),                0, wxALL, 10 );
+    button_sizer2->Add( new wxButton( secondPanel, ID_DELETE_LIST, "Delete selected"),        0, wxALL, 10 );
+    button_sizer2->Add( new wxButton( secondPanel, ID_GOTO,        "Goto 50"),                0, wxALL, 10 );
+    button_sizer2->Add( new wxButton( secondPanel, ID_ADD_MANY,    "Add 1000"),               0, wxALL, 10 );
+    button_sizer2->Add( new wxButton( secondPanel, ID_HIDE_ATTRIBUTES,    "Hide attributes"), 0, wxALL, 10 );
+    button_sizer2->Add( new wxButton( secondPanel, ID_SHOW_ATTRIBUTES,    "Show attributes"), 0, wxALL, 10 );
 
     wxSizer *secondPanelSz = new wxBoxSizer( wxVERTICAL );
     secondPanelSz->Add(m_ctrl[1], 1, wxGROW|wxALL, 5);
 
     wxSizer *secondPanelSz = new wxBoxSizer( wxVERTICAL );
     secondPanelSz->Add(m_ctrl[1], 1, wxGROW|wxALL, 5);
@@ -420,9 +484,16 @@ MyFrame::MyFrame(wxFrame *frame, const wxString &title, int x, int y, int w, int
     wxPanel *fourthPanel = new wxPanel( m_notebook, wxID_ANY );
 
     BuildDataViewCtrl(fourthPanel, 3);    // sets m_ctrl[3]
     wxPanel *fourthPanel = new wxPanel( m_notebook, wxID_ANY );
 
     BuildDataViewCtrl(fourthPanel, 3);    // sets m_ctrl[3]
+    // Buttons
+    wxBoxSizer *button_sizer4 = new wxBoxSizer( wxHORIZONTAL );
+    button_sizer4->Add( new wxButton( fourthPanel, ID_DELETE_TREE_ITEM, "Delete Selected"), 0, wxALL, 10 );
+    button_sizer4->Add( new wxButton( fourthPanel, ID_DELETE_ALL_TREE_ITEMS, "Delete All"), 0, wxALL, 10 );
+    button_sizer4->Add( new wxButton( fourthPanel, ID_ADD_TREE_ITEM, "Add Item"), 0, wxALL, 10 );
+    button_sizer4->Add( new wxButton( fourthPanel, ID_ADD_TREE_CONTAINER_ITEM, "Add Container"), 0, wxALL, 10 );
 
     wxSizer *fourthPanelSz = new wxBoxSizer( wxVERTICAL );
     fourthPanelSz->Add(m_ctrl[3], 1, wxGROW|wxALL, 5);
 
     wxSizer *fourthPanelSz = new wxBoxSizer( wxVERTICAL );
     fourthPanelSz->Add(m_ctrl[3], 1, wxGROW|wxALL, 5);
+    fourthPanelSz->Add(button_sizer4);
     fourthPanel->SetSizerAndFit(fourthPanelSz);
 
 
     fourthPanel->SetSizerAndFit(fourthPanelSz);
 
 
@@ -437,12 +508,6 @@ MyFrame::MyFrame(wxFrame *frame, const wxString &title, int x, int y, int w, int
 
     wxSizer* mainSizer = new wxBoxSizer(wxVERTICAL);
 
 
     wxSizer* mainSizer = new wxBoxSizer(wxVERTICAL);
 
-    m_log = new wxTextCtrl( this, wxID_ANY, wxString(), wxDefaultPosition,
-                            wxDefaultSize, wxTE_MULTILINE );
-    m_log->SetMinSize(wxSize(-1, 100));
-    m_logOld = wxLog::SetActiveTarget(new wxLogTextCtrl(m_log));
-    wxLogMessage( "This is the log window" );
-
     mainSizer->Add( m_notebook, 1, wxGROW );
     mainSizer->Add( m_log, 0, wxGROW );
 
     mainSizer->Add( m_notebook, 1, wxGROW );
     mainSizer->Add( m_log, 0, wxGROW );
 
@@ -464,12 +529,17 @@ void MyFrame::BuildDataViewCtrl(wxPanel* parent, unsigned int nPanel, unsigned l
             m_ctrl[0] =
                 new wxDataViewCtrl( parent, ID_MUSIC_CTRL, wxDefaultPosition,
                                     wxDefaultSize, style );
             m_ctrl[0] =
                 new wxDataViewCtrl( parent, ID_MUSIC_CTRL, wxDefaultPosition,
                                     wxDefaultSize, style );
+            m_ctrl[0]->Connect(wxEVT_CHAR,
+                               wxKeyEventHandler(MyFrame::OnDataViewChar),
+                               NULL, this);
 
             m_music_model = new MyMusicTreeModel;
             m_ctrl[0]->AssociateModel( m_music_model.get() );
 
 
             m_music_model = new MyMusicTreeModel;
             m_ctrl[0]->AssociateModel( m_music_model.get() );
 
+#if wxUSE_DRAG_AND_DROP && wxUSE_UNICODE
             m_ctrl[0]->EnableDragSource( wxDF_UNICODETEXT );
             m_ctrl[0]->EnableDropTarget( wxDF_UNICODETEXT );
             m_ctrl[0]->EnableDragSource( wxDF_UNICODETEXT );
             m_ctrl[0]->EnableDropTarget( wxDF_UNICODETEXT );
+#endif // wxUSE_DRAG_AND_DROP && wxUSE_UNICODE
 
             // column 0 of the view control:
 
 
             // column 0 of the view control:
 
@@ -523,7 +593,7 @@ void MyFrame::BuildDataViewCtrl(wxPanel* parent, unsigned int nPanel, unsigned l
 
             // column 5 of the view control:
 
 
             // column 5 of the view control:
 
-            MyCustomRenderer *cr = new MyCustomRenderer( wxDATAVIEW_CELL_ACTIVATABLE, wxALIGN_RIGHT );
+            MyCustomRenderer *cr = new MyCustomRenderer;
             wxDataViewColumn *column5 =
                 new wxDataViewColumn( "custom", cr, 5, -1, wxALIGN_LEFT,
                                       wxDATAVIEW_COL_RESIZABLE );
             wxDataViewColumn *column5 =
                 new wxDataViewColumn( "custom", cr, 5, -1, wxALIGN_LEFT,
                                       wxDATAVIEW_COL_RESIZABLE );
@@ -538,7 +608,7 @@ void MyFrame::BuildDataViewCtrl(wxPanel* parent, unsigned int nPanel, unsigned l
     case 1:
         {
             wxASSERT(!m_ctrl[1] && !m_list_model);
     case 1:
         {
             wxASSERT(!m_ctrl[1] && !m_list_model);
-            m_ctrl[1] = new wxDataViewCtrl( parent, wxID_ANY, wxDefaultPosition,
+            m_ctrl[1] = new wxDataViewCtrl( parent, ID_ATTR_CTRL, wxDefaultPosition,
                                             wxDefaultSize, style );
 
             m_list_model = new MyListModel;
                                             wxDefaultSize, style );
 
             m_list_model = new MyListModel;
@@ -547,14 +617,26 @@ void MyFrame::BuildDataViewCtrl(wxPanel* parent, unsigned int nPanel, unsigned l
             // the various columns
             m_ctrl[1]->AppendTextColumn("editable string",
                                         MyListModel::Col_EditableText,
             // the various columns
             m_ctrl[1]->AppendTextColumn("editable string",
                                         MyListModel::Col_EditableText,
-                                        wxDATAVIEW_CELL_EDITABLE);
+                                        wxDATAVIEW_CELL_EDITABLE,
+                                        wxCOL_WIDTH_AUTOSIZE);
             m_ctrl[1]->AppendIconTextColumn("icon",
                                             MyListModel::Col_IconText,
             m_ctrl[1]->AppendIconTextColumn("icon",
                                             MyListModel::Col_IconText,
-                                            wxDATAVIEW_CELL_EDITABLE);
-            m_ctrl[1]->AppendColumn(
+                                            wxDATAVIEW_CELL_EDITABLE,
+                                            wxCOL_WIDTH_AUTOSIZE);
+
+            m_attributes =
                 new wxDataViewColumn("attributes",
                                      new wxDataViewTextRenderer,
                 new wxDataViewColumn("attributes",
                                      new wxDataViewTextRenderer,
-                                     MyListModel::Col_TextWithAttr)
+                                     MyListModel::Col_TextWithAttr,
+                                     wxCOL_WIDTH_AUTOSIZE,
+                                     wxALIGN_RIGHT,
+                                     wxDATAVIEW_COL_REORDERABLE | wxDATAVIEW_COL_RESIZABLE );
+            m_ctrl[1]->AppendColumn( m_attributes );
+
+            m_ctrl[1]->AppendColumn(
+                new wxDataViewColumn("custom renderer",
+                                     new MyCustomRenderer,
+                                     MyListModel::Col_Custom)
             );
         }
         break;
             );
         }
         break;
@@ -567,6 +649,10 @@ void MyFrame::BuildDataViewCtrl(wxPanel* parent, unsigned int nPanel, unsigned l
                                         wxDefaultSize, style );
             m_ctrl[2] = lc;
 
                                         wxDefaultSize, style );
             m_ctrl[2] = lc;
 
+            MyListStoreDerivedModel* page2_model = new MyListStoreDerivedModel();
+            lc->AssociateModel(page2_model);
+            page2_model->DecRef();
+
             lc->AppendToggleColumn( "Toggle" );
             lc->AppendTextColumn( "Text" );
             lc->AppendProgressColumn( "Progress" );
             lc->AppendToggleColumn( "Toggle" );
             lc->AppendTextColumn( "Text" );
             lc->AppendProgressColumn( "Progress" );
@@ -589,12 +675,12 @@ void MyFrame::BuildDataViewCtrl(wxPanel* parent, unsigned int nPanel, unsigned l
             wxASSERT(!m_ctrl[3]);
             wxDataViewTreeCtrl* tc =
                 new wxDataViewTreeCtrl( parent, wxID_ANY, wxDefaultPosition,
             wxASSERT(!m_ctrl[3]);
             wxDataViewTreeCtrl* tc =
                 new wxDataViewTreeCtrl( parent, wxID_ANY, wxDefaultPosition,
-                                        wxDefaultSize, style );
+                                        wxDefaultSize, style | wxDV_NO_HEADER );
             m_ctrl[3] = tc;
 
             wxImageList *ilist = new wxImageList( 16, 16 );
             ilist->Add( wxIcon(wx_small_xpm) );
             m_ctrl[3] = tc;
 
             wxImageList *ilist = new wxImageList( 16, 16 );
             ilist->Add( wxIcon(wx_small_xpm) );
-            tc->SetImageList( ilist );
+            tc->AssignImageList( ilist );
 
             wxDataViewItem parent =
                 tc->AppendContainer( wxDataViewItem(0), "The Root", 0 );
 
             wxDataViewItem parent =
                 tc->AppendContainer( wxDataViewItem(0), "The Root", 0 );
@@ -738,6 +824,8 @@ void MyFrame::OnAbout( wxCommandEvent& WXUNUSED(event) )
 // MyFrame - event handlers for the first page
 // ----------------------------------------------------------------------------
 
 // MyFrame - event handlers for the first page
 // ----------------------------------------------------------------------------
 
+#if wxUSE_DRAG_AND_DROP
+
 void MyFrame::OnBeginDrag( wxDataViewEvent &event )
 {
     wxDataViewItem item( event.GetItem() );
 void MyFrame::OnBeginDrag( wxDataViewEvent &event )
 {
     wxDataViewItem item( event.GetItem() );
@@ -753,6 +841,7 @@ void MyFrame::OnBeginDrag( wxDataViewEvent &event )
     wxTextDataObject *obj = new wxTextDataObject;
     obj->SetText( node->m_title );
     event.SetDataObject( obj );
     wxTextDataObject *obj = new wxTextDataObject;
     obj->SetText( node->m_title );
     event.SetDataObject( obj );
+    event.SetDragFlags(wxDrag_AllowMove); // allows both copy and move
 }
 
 void MyFrame::OnDropPossible( wxDataViewEvent &event )
 }
 
 void MyFrame::OnDropPossible( wxDataViewEvent &event )
@@ -790,12 +879,14 @@ void MyFrame::OnDrop( wxDataViewEvent &event )
     wxLogMessage( "Text dropped: %s", obj.GetText() );
 }
 
     wxLogMessage( "Text dropped: %s", obj.GetText() );
 }
 
+#endif // wxUSE_DRAG_AND_DROP
+
 void MyFrame::OnAddMozart( wxCommandEvent& WXUNUSED(event) )
 {
 void MyFrame::OnAddMozart( wxCommandEvent& WXUNUSED(event) )
 {
-    m_music_model->AddToClassical( "Kleine Nachtmusik", "Wolfgang Mozart", 1787 );
+    m_music_model->AddToClassical( "Eine kleine Nachtmusik", "Wolfgang Mozart", 1787 );
 }
 
 }
 
-void MyFrame::OnDeleteMusic( wxCommandEvent& WXUNUSED(event) )
+void MyFrame::DeleteSelectedItems()
 {
     wxDataViewItemArray items;
     int len = m_ctrl[0]->GetSelections( items );
 {
     wxDataViewItemArray items;
     int len = m_ctrl[0]->GetSelections( items );
@@ -804,6 +895,11 @@ void MyFrame::OnDeleteMusic( wxCommandEvent& WXUNUSED(event) )
             m_music_model->Delete( items[i] );
 }
 
             m_music_model->Delete( items[i] );
 }
 
+void MyFrame::OnDeleteSelected( wxCommandEvent& WXUNUSED(event) )
+{
+    DeleteSelectedItems();
+}
+
 void MyFrame::OnDeleteYear( wxCommandEvent& WXUNUSED(event) )
 {
     m_ctrl[0]->DeleteColumn( m_ctrl[0]->GetColumn( 2 ) );
 void MyFrame::OnDeleteYear( wxCommandEvent& WXUNUSED(event) )
 {
     m_ctrl[0]->DeleteColumn( m_ctrl[0]->GetColumn( 2 ) );
@@ -835,20 +931,53 @@ void MyFrame::OnExpand( wxCommandEvent& WXUNUSED(event) )
         m_ctrl[0]->Expand( item );
 }
 
         m_ctrl[0]->Expand( item );
 }
 
-void MyFrame::OnValueChanged( wxDataViewEvent &event )
+void MyFrame::OnShowCurrent(wxCommandEvent& WXUNUSED(event))
 {
 {
-    if (!m_log)
-        return;
+    wxDataViewItem item = m_ctrl[0]->GetCurrentItem();
+    if ( item.IsOk() )
+    {
+        wxLogMessage("Current item: \"%s\" by %s",
+                     m_music_model->GetTitle(item),
+                     m_music_model->GetArtist(item));
+    }
+    else
+    {
+        wxLogMessage("There is no current item.");
+    }
 
 
-    wxLogMessage( "wxEVT_DATAVIEW_ITEM_VALUE_CHANGED, Item Id: %d;  Column: %d",
-                  event.GetItem().GetID(), event.GetColumn() );
+    wxDataViewColumn *col = m_ctrl[0]->GetCurrentColumn();
+    if ( col )
+    {
+        wxLogMessage("Current column: %d",
+                     m_ctrl[0]->GetColumnPosition(col));
+    }
+    else
+    {
+        wxLogMessage("There is no current column.");
+    }
 }
 
 }
 
-void MyFrame::OnActivated( wxDataViewEvent &event )
+void MyFrame::OnSetNinthCurrent(wxCommandEvent& WXUNUSED(event))
 {
 {
-    if(!m_log)
+    wxDataViewItem item(m_music_model->GetNinthItem());
+    if ( !item.IsOk() )
+    {
+        wxLogError( "Cannot make the ninth symphony current: it was removed!" );
         return;
         return;
+    }
 
 
+    m_ctrl[0]->SetCurrentItem(item);
+}
+
+void MyFrame::OnValueChanged( wxDataViewEvent &event )
+{
+    wxString title = m_music_model->GetTitle( event.GetItem() );
+    wxLogMessage( "wxEVT_DATAVIEW_ITEM_VALUE_CHANGED, Item Id: %s;  Column: %d",
+                  title, event.GetColumn() );
+}
+
+void MyFrame::OnActivated( wxDataViewEvent &event )
+{
     wxString title = m_music_model->GetTitle( event.GetItem() );
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_ACTIVATED, Item: %s", title );
 
     wxString title = m_music_model->GetTitle( event.GetItem() );
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_ACTIVATED, Item: %s", title );
 
@@ -860,9 +989,6 @@ void MyFrame::OnActivated( wxDataViewEvent &event )
 
 void MyFrame::OnSelectionChanged( wxDataViewEvent &event )
 {
 
 void MyFrame::OnSelectionChanged( wxDataViewEvent &event )
 {
-    if(!m_log)
-        return;
-
     wxString title = m_music_model->GetTitle( event.GetItem() );
     if (title.empty())
         title = "None";
     wxString title = m_music_model->GetTitle( event.GetItem() );
     if (title.empty())
         title = "None";
@@ -872,9 +998,6 @@ void MyFrame::OnSelectionChanged( wxDataViewEvent &event )
 
 void MyFrame::OnExpanding( wxDataViewEvent &event )
 {
 
 void MyFrame::OnExpanding( wxDataViewEvent &event )
 {
-    if (!m_log)
-        return;
-
     wxString title = m_music_model->GetTitle( event.GetItem() );
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_EXPANDING, Item: %s", title );
 }
     wxString title = m_music_model->GetTitle( event.GetItem() );
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_EXPANDING, Item: %s", title );
 }
@@ -887,9 +1010,6 @@ void MyFrame::OnStartEditing( wxDataViewEvent &event )
     {
         event.Veto();
 
     {
         event.Veto();
 
-        if (!m_log)
-           return;
-
         wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_START_EDITING vetoed. Artist: %s", artist );
     }
     else
         wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_START_EDITING vetoed. Artist: %s", artist );
     }
     else
@@ -899,54 +1019,36 @@ void MyFrame::OnStartEditing( wxDataViewEvent &event )
 
 void MyFrame::OnEditingStarted( wxDataViewEvent &event )
 {
 
 void MyFrame::OnEditingStarted( wxDataViewEvent &event )
 {
-    if (!m_log)
-        return;
-
     wxString title = m_music_model->GetTitle( event.GetItem() );
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_EDITING_STARTED, Item: %s", title );
 }
 
 void MyFrame::OnEditingDone( wxDataViewEvent &event )
 {
     wxString title = m_music_model->GetTitle( event.GetItem() );
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_EDITING_STARTED, Item: %s", title );
 }
 
 void MyFrame::OnEditingDone( wxDataViewEvent &event )
 {
-    if (!m_log)
-        return;
-
     wxString title = m_music_model->GetTitle( event.GetItem() );
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_EDITING_DONE, Item: %s", title );
 }
 
 void MyFrame::OnExpanded( wxDataViewEvent &event )
 {
     wxString title = m_music_model->GetTitle( event.GetItem() );
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_EDITING_DONE, Item: %s", title );
 }
 
 void MyFrame::OnExpanded( wxDataViewEvent &event )
 {
-    if (!m_log)
-        return;
-
     wxString title = m_music_model->GetTitle( event.GetItem() );
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_EXPANDED, Item: %s", title );
 }
 
 void MyFrame::OnCollapsing( wxDataViewEvent &event )
 {
     wxString title = m_music_model->GetTitle( event.GetItem() );
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_EXPANDED, Item: %s", title );
 }
 
 void MyFrame::OnCollapsing( wxDataViewEvent &event )
 {
-    if (!m_log)
-        return;
-
     wxString title = m_music_model->GetTitle( event.GetItem() );
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_COLLAPSING, Item: %s", title );
 }
 
 void MyFrame::OnCollapsed( wxDataViewEvent &event )
 {
     wxString title = m_music_model->GetTitle( event.GetItem() );
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_COLLAPSING, Item: %s", title );
 }
 
 void MyFrame::OnCollapsed( wxDataViewEvent &event )
 {
-    if (!m_log)
-        return;
-
     wxString title = m_music_model->GetTitle( event.GetItem() );
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_COLLAPSED, Item: %s", title );
 }
 
 void MyFrame::OnContextMenu( wxDataViewEvent &event )
 {
     wxString title = m_music_model->GetTitle( event.GetItem() );
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_COLLAPSED, Item: %s", title );
 }
 
 void MyFrame::OnContextMenu( wxDataViewEvent &event )
 {
-    if (!m_log)
-        return;
-
     wxString title = m_music_model->GetTitle( event.GetItem() );
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_CONTEXT_MENU, Item: %s", title );
 
     wxString title = m_music_model->GetTitle( event.GetItem() );
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_ITEM_CONTEXT_MENU, Item: %s", title );
 
@@ -958,14 +1060,23 @@ void MyFrame::OnContextMenu( wxDataViewEvent &event )
     m_ctrl[0]->PopupMenu(&menu);
 }
 
     m_ctrl[0]->PopupMenu(&menu);
 }
 
-void MyFrame::OnHeaderClick( wxDataViewEvent &event )
+void MyFrame::OnAttrHeaderClick( wxDataViewEvent &event )
 {
     // we need to skip the event to let the default behaviour of sorting by
     // this column when it is clicked to take place
     event.Skip();
 
 {
     // we need to skip the event to let the default behaviour of sorting by
     // this column when it is clicked to take place
     event.Skip();
 
-    if (!m_log)
-        return;
+    int pos = m_ctrl[1]->GetColumnPosition( event.GetDataViewColumn() );
+
+    wxLogMessage( "wxEVT_COMMAND_DATAVIEW_COLUMN_HEADER_CLICK, Column position: %d", pos );
+    wxLogMessage( "Column title: %s  Column width: %d", event.GetDataViewColumn()->GetTitle(), event.GetDataViewColumn()->GetWidth() );
+}
+
+void MyFrame::OnHeaderClick( wxDataViewEvent &event )
+{
+    // we need to skip the event to let the default behaviour of sorting by
+    // this column when it is clicked to take place
+    event.Skip();
 
     int pos = m_ctrl[0]->GetColumnPosition( event.GetDataViewColumn() );
 
 
     int pos = m_ctrl[0]->GetColumnPosition( event.GetDataViewColumn() );
 
@@ -975,9 +1086,6 @@ void MyFrame::OnHeaderClick( wxDataViewEvent &event )
 
 void MyFrame::OnHeaderRightClick( wxDataViewEvent &event )
 {
 
 void MyFrame::OnHeaderRightClick( wxDataViewEvent &event )
 {
-    if(!m_log)
-        return;
-
     int pos = m_ctrl[0]->GetColumnPosition( event.GetDataViewColumn() );
 
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_COLUMN_HEADER_RIGHT_CLICK, Column position: %d", pos );
     int pos = m_ctrl[0]->GetColumnPosition( event.GetDataViewColumn() );
 
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_COLUMN_HEADER_RIGHT_CLICK, Column position: %d", pos );
@@ -985,24 +1093,19 @@ void MyFrame::OnHeaderRightClick( wxDataViewEvent &event )
 
 void MyFrame::OnSorted( wxDataViewEvent &event )
 {
 
 void MyFrame::OnSorted( wxDataViewEvent &event )
 {
-    if(!m_log)
-        return;
-
     int pos = m_ctrl[0]->GetColumnPosition( event.GetDataViewColumn() );
 
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_COLUMN_SORTED, Column position: %d", pos );
 }
 
     int pos = m_ctrl[0]->GetColumnPosition( event.GetDataViewColumn() );
 
     wxLogMessage( "wxEVT_COMMAND_DATAVIEW_COLUMN_SORTED, Column position: %d", pos );
 }
 
-void MyFrame::OnRightClick( wxMouseEvent &event )
+void MyFrame::OnDataViewChar(wxKeyEvent& event)
 {
 {
-    if(!m_log)
-        return;
-
-    wxLogMessage( "wxEVT_MOUSE_RIGHT_UP, Click Point is X: %d, Y: %d",
-                 event.GetX(), event.GetY() );
+    if ( event.GetKeyCode() == WXK_DELETE )
+        DeleteSelectedItems();
+    else
+        event.Skip();
 }
 
 }
 
-
 // ----------------------------------------------------------------------------
 // MyFrame - event handlers for the second page
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // MyFrame - event handlers for the second page
 // ----------------------------------------------------------------------------
@@ -1031,3 +1134,52 @@ void MyFrame::OnAddMany(wxCommandEvent& WXUNUSED(event))
     m_list_model->AddMany();
 }
 
     m_list_model->AddMany();
 }
 
+void MyFrame::OnHideAttributes(wxCommandEvent& WXUNUSED(event))
+{
+    m_attributes->SetHidden(true);
+}
+
+void MyFrame::OnShowAttributes(wxCommandEvent& WXUNUSED(event))
+{
+    m_attributes->SetHidden(false);
+}
+
+// ----------------------------------------------------------------------------
+// MyFrame - event handlers for the fourth page
+// ----------------------------------------------------------------------------
+
+void MyFrame::OnDeleteTreeItem(wxCommandEvent& WXUNUSED(event))
+{
+    wxDataViewTreeCtrl* ctrl = (wxDataViewTreeCtrl*) m_ctrl[3];
+    wxDataViewItem selected = ctrl->GetSelection();
+    if (!selected.IsOk())
+        return;
+
+    ctrl->DeleteItem(selected);
+}
+
+void MyFrame::OnDeleteAllTreeItems(wxCommandEvent& WXUNUSED(event))
+{
+    wxDataViewTreeCtrl* ctrl = (wxDataViewTreeCtrl*) m_ctrl[3];
+    ctrl->DeleteAllItems();
+}
+
+void MyFrame::OnAddTreeItem(wxCommandEvent& WXUNUSED(event))
+{
+    wxDataViewTreeCtrl* ctrl = (wxDataViewTreeCtrl*) m_ctrl[3];
+    wxDataViewItem selected = ctrl->GetSelection();
+    if (ctrl->IsContainer(selected)) {
+        wxDataViewItem newitem = ctrl->AppendItem( selected, "Item", 0 );
+        ctrl->Select(newitem);
+        ctrl->EditItem(newitem, ctrl->GetColumn(0));
+    }
+}
+
+void MyFrame::OnAddTreeContainerItem(wxCommandEvent& WXUNUSED(event))
+{
+    wxDataViewTreeCtrl* ctrl = (wxDataViewTreeCtrl*) m_ctrl[3];
+    wxDataViewItem selected = ctrl->GetSelection();
+    if (ctrl->IsContainer(selected))
+        ctrl->AppendContainer(selected, "Container", 0 );
+}
+
wxWidgets (Impactor)