+void wxEnableTopLevelWindows(bool enable)
+{
+ wxWindowList::Node *node;
+ for ( node = wxTopLevelWindows.GetFirst(); node; node = node->GetNext() )
+ node->GetData()->Enable(enable);
+}
+
+// Yield to other apps/messages and disable user input
+bool wxSafeYield(wxWindow *win)
+{
+ wxEnableTopLevelWindows(FALSE);
+ // always enable ourselves
+ if ( win )
+ win->Enable(TRUE);
+ bool rc = wxYield();
+ wxEnableTopLevelWindows(TRUE);
+ return rc;
+}