Added IsTopLevel() as a virtual function.

Added fontenum.hto filelist.txt,
  Changed window positioning code again,
  some more related things.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4372 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/mdi.h

@@ -142,6 +142,8 @@ public:
                 long style = wxDEFAULT_FRAME_STYLE,
                 const wxString& name = wxFrameNameStr);
 
+    virtual bool IsTopLevel() const { return FALSE; }
+    
     // MDI operations
     virtual void Maximize(bool maximize = TRUE);
     virtual void Restore();