added accessors for last focus

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15668 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/mac/frame.h

@@ -101,6 +101,10 @@ public:
     wxMacToolTip* m_hwndToolTip ;
 #endif // tooltips
 
+    // called by wxWindow whenever it gets focus
+    void SetLastFocus(wxWindow *win) { m_winLastFocused = win; }
+    wxWindow *GetLastFocus() const { return m_winLastFocused; }
+
 protected:
     // common part of all ctors
     void Init();