Pass focus window to submenu items too (no reason I can think of not to).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@20840 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/framecmn.cpp

@@ -411,7 +411,7 @@ void wxFrameBase::DoMenuUpdates(wxMenu* menu, wxWindow* focusWin)
             }
 
             if (item->GetSubMenu())
-                DoMenuUpdates(item->GetSubMenu(), (wxWindow*) NULL);
+                DoMenuUpdates(item->GetSubMenu(), focusWin);
         }
         node = node->GetNext();
     }