Various Dialog Editor-related mods; Dlg Ed. getting usable now under MSW.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@494 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/radiobox.h

@@ -121,6 +121,8 @@ public:
   inline WXHWND *GetRadioButtons(void) const { return m_radioButtons; }
   bool ContainsHWND(WXHWND hWnd) const ;
 
+  long MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam);
+
 protected:
   WXHWND *          m_radioButtons;
   int               m_majorDim ;