Interface functions without output parameters

Just want to know why Interface functions without any Output parameters dont appear in a blueprint class that implements them?

Id like to have some implementation in a function ive declared in an Interface but it doesnt appear in the function list to be implementable.

http://ltbb.org/devilsd/UnrealEngine/images/interface.JPG

http://ltbb.org/devilsd/UnrealEngine/images/functionList.JPG

At least, you should be able to right-click in the event graph of the blueprint that implements the interface and the corresponding implementable Events should be present in the list. Right click in the graph and start typing the name of any function that you want to implement.

Thanks for the tip. Though i still believe this might be a bug unless someone can tell me otherwise why they wont appear in the list by default.