event, otherwise PAGE\_CHANGED is probably enough. In any case, it is probably
unnecessary to process both events at once.
+{\bf NB:} under Windows, GetSelection() will return the same value as
+GetOldSelection() when called from PAGE\_CHANGING handler and not the page
+which is going to be selected if the handler doesn't call Veto().
+
\wxheading{Derived from}
\helpref{wxNotifyEvent}{wxnotifyevent}\\