reset busy cursor checkbox when switching to another control

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40819 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/widgets/widgets.cpp

@@ -636,6 +636,8 @@ void WidgetsFrame::OnPageChanged(WidgetsBookCtrlEvent& event)
     if ( item )
         item->Check();
 
+    GetMenuBar()->Check(Widgets_BusyCursor, false);
+
     // lazy creation of the pages
     WidgetsPage *page = CurrentPage();
     if ( page->GetChildren().empty() )