added m_invokingWindow to wxMenuBar on wxMac

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@18371 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/mac/menu.h

@@ -185,6 +185,7 @@ public:
 protected:
     // common part of all ctors
     void Init();
+    wxWindow        *m_invokingWindow;
 
 #if WXWIN_COMPATIBILITY
     wxEvtHandler *m_eventHandler;