A custom event added by a programmer to a class. Custom created events need to be processed, usually by an event dispatcher within a framework.
Delphi Prism Member Events
Like all .Net languages, Prism events are a separate type of class member. You define a member event by using the event keyword. Events depend on Delegates to define the signature (the type) of the event they represent and they maintain a list of multiple subscribers - unlike in Delphi for Win32, where each event can only have one handler