+Please note that you \textbf{must} use wxRTTI macros
+\helpref{DECLARE\_DYNAMIC\_CLASS}{declaredynamicclass} and
+\helpref{IMPLEMENT\_DYNAMIC\_CLASS}{implementdynamicclass} if you override this
+function because otherwise the base class considers that it is not overridden
+and uses the default comparison, i.e. sorts the items alphabetically, which
+allows it optimize away the calls to the virtual function completely.