1. wxMenu changes: wxMenuBase appears, several new functions for dynamic menu

handling as well
2. new sample: menu
3. small corrections to wxFileHistory made possible by wxMenu changes
4. ugly fix for panel loaded from resources and TABbing
5. wxDataObject &c doc updates


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4288 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/frame.cpp

@@ -671,10 +671,9 @@ bool wxFrame::ProcessCommand(int id)
         return FALSE;
 
     wxMenuItem *item = bar->FindItemForId(id);
-
-    if ( item &&  item->IsCheckable() )
+    if ( item && item->IsCheckable() )
     {
-        bar->Check(id, !bar->IsChecked(id)) ;
+        item->Toggle();
     }
 
     wxCommandEvent commandEvent(wxEVT_COMMAND_MENU_SELECTED, id);