Event fired when a mapped event is fired by the ActiveX control. For mapping an event one must call the AddEventID function.
NOTE: You are required to call the AknowledgeEvent if you know the parameters count of the ActiveX event, or more conveniently {ClearEvent}(if you don't know the number of parameters) at the end of your event handler.
The ActiveX event parameters can be obtained using the GetEventParameter function.
Return value:
This event can close the application by returning MSG_APPLICATION_QUIT. Any other return value will be ignored.