GUIBaseContext :: doAfterOrder - Control order handler

The post-event handler for order events (GEV_Ordered) allows reacting on order change for a list, tree or table (e.g. resetting current list item).

The handler should return one of the following return codes:

• -1 (not handled) - the event handler will be removed from the handler list and is not called anymore.
• 1 (error) - Returning an error has no effect for post-events.
• 0 (ok) - Event handler terminated successfully.