GUIBaseContext :: doAfterMouseClick - Mouse click handler

The handler is called, when the mouse has been clicked in a control (GEV_MouseClick event).

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 (stop) - stop calling event handler for the control parent
• 0 (ok) - Event handler terminated successfully.