> Is it possible to ensure I will get the first bite at the event
No. Even if you could know for sure the order that the handlers will be
called by the event delegate, you should never depend upon that.
If you are subclassing, then you should override the OnEnter() method
rather than subscribing to the Enter event, for exactly this reason.
However, if your event subscriber is not a subclass of the class that
defines the Enter event, then there are no guarantees about the order
in which you'll be called.
it possible to refuse access to this event lower down the chain
Technically, no, but a similar mechanism does exist in .NET. Take a
look at KeyPressEventArgs: event arguments that contain a boolean
(Handled) that indicates "I've already handled this... don't bother
with it." In this case, however, it's not events "lower down the chain"
that are being advised that the event has been "handled," but rather
the default behaviour in the defining class that kicks in _after_ the
event is raised and only if Handled comes back from all event handlers
as false.
