Hi Rakesh,
Events are not methods and they are not used as call method.
Events are triggers and methods are mapped to this triggers.
To call an event we use the RAISE EVENT command and that you can find in the EXECUTE_FCODE method of the class.
For more details of events.
http://help.sap.com/saphelp_nw70/helpdata/en/71/a8a77955bc11d194aa0000e8353423/content.htm
For further queries ASK cheers.
