Begins the definition of your event map.
Specifies the name of the control class whose event map this is.
Specifies the name of the base class of theClass.
In the implementation (.cpp) file that defines the member functions for your class, start the event map with the BEGIN_EVENT_MAP macro, then add macro entries for each of your events, and complete the event map with the END_EVENT_MAP macro.
For more information on event maps and the BEGIN_EVENT_MAP macro, see the article ActiveX Controls: Events.