Added test for wxTreeCtrl::GetChildrenCount()

Fixed Reparent (added heaps of debug code for this)
  Small mods to glcanvas


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3799 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk1/frame.cpp

@@ -270,6 +270,8 @@ gtk_frame_realized_callback( GtkWidget *widget, wxFrame *win )
 
 static void wxInsertChildInFrame( wxFrame* parent, wxWindow* child )
 {
+    wxASSERT( GTK_IS_WIDGET(child->m_widget) );
+    
     if (!parent->m_insertInClientArea)
     {
         /* these are outside the client area */