implemented wxActivateEvent and restoring focus after a TLW that owned it was destroyed

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@46207 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/dfb/nonownedwnd.h

@@ -88,6 +88,10 @@ protected:
     // wxWindows as in wx
     void SetDfbFocus();
 
+    // overriden in wxTopLevelWindowDFB, there's no common handling for wxTLW
+    // and wxPopupWindow to be done here
+    virtual void HandleFocusEvent(const wxDFBWindowEvent& WXUNUSED(event_)) {}
+
 private:
     // do queued painting in idle time
     void HandleQueuedPaintRequests();