by default no events
forwards one or more events from a given dispatcher to the current one i.e. when one of the given events is fired in 'from' it will be forwarded to all my listeners
the event dispatcher to forward from
the event types to forward
helper function that will be called upon a listener has changed
event type
registered or de registered
removes the forwarding declarations
the originated dispatcher
event types to forward
return the list of events to be able to dispatch