+
+ return winOldDefault;
+}
+
+// return the top level parent window if it's not being deleted yet, otherwise
+// return NULL
+static wxTopLevelWindow *GetTLWParentIfNotBeingDeleted(wxWindow *win)
+{
+ for ( ;; )
+ {
+ // IsTopLevel() will return false for a wxTLW being deleted, so we also
+ // need the parent test for this case
+ wxWindow * const parent = win->GetParent();
+ if ( !parent || win->IsTopLevel() )
+ {
+ if ( win->IsBeingDeleted() )
+ return NULL;
+
+ break;
+ }
+
+ win = parent;
+ }
+
+ wxASSERT_MSG( win, _T("button without top level parent?") );
+
+ wxTopLevelWindow * const tlw = wxDynamicCast(win, wxTopLevelWindow);
+ wxASSERT_MSG( tlw, _T("logic error in GetTLWParentIfNotBeingDeleted()") );
+
+ return tlw;