Improve implementation of DefaultRoute property of ExclusiveGateway
Notes from Kris:
[In the drop-down] the name alone might not (always) be sufficient, as a lot of nodes like events and gateways typically have no name, how would it behave if this case? Not sure what the best solution would be, but showing a blank line probably isn't. Maybe simply adding the node type (so there is always at least something)?