+ @event{EVT_WIZARD_BEFORE_PAGE_CHANGED(id, func)}
+ Called after Next is clicked but before GetNext is called. Unlike EVT_WIZARD_CHANGING,
+ the handler for this function can change state that might affect the return value of
+ GetNext. This event can be vetoed.
+ @event{EVT_WIZARD_PAGE_SHOWN(id, func)}
+ The page was shown and laid out (this event cannot be vetoed).