prevent the parent window from losing activation when a popup is shown

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15662 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/frame.cpp

@@ -841,7 +841,7 @@ long wxFrame::MSWWindowProc(WXUINT message, WXWPARAM wParam, WXLPARAM lParam)
     }
 
     if ( !processed )
-        rc = wxWindow::MSWWindowProc(message, wParam, lParam);
+        rc = wxFrameBase::MSWWindowProc(message, wParam, lParam);
 
     return rc;
 }