+Any event that is posted to the wxWindows event system for later action (via
+\helpref{wxEvtHandler::AddPendingEvent}{wxevthandleraddpendingevent} or
+\helpref{wxPostEvent}{wxpostevent}) must implement this method. All wxWindows
+events fully implement this method, but any derived events implemented by the
+user should also implement this method just in case they (or some event
+derived from them) are ever posted.