This event is delivered to a
dialog when there is an external request to close that dialog. If the
event is not consumed by any installed dialog event handler, the default
handler for this event closes the corresponding dialog.
Construct a new Event with the specified event source, target
and type. If the source or target is set to null, it is replaced
by the NULL_SOURCE_TARGET value.
Creates and returns a copy of this event with the specified event source
and target. If the source or target is set to null, it is
replaced by the NULL_SOURCE_TARGET value.
Gets the event type of this event. Objects of the same Event
class can have different event types. These event types further specify
what kind of event occurred.