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Hello. I must admit that the documentation regarding Y.EventTarget and emitFacade once confused me as well. I think I can help straighten this out.

The confusion comes from the publish method on Y.EventTarget. It accepts an option called emitFacade which defaults to false. There is an instance level parameter to change emitFacade to default to true. When Y.Attribute mixes itself with Y.EventTarget it configures emitFacade to default to true. Therefore Y.Base and anything else that extends Y.Attribute automatically defaults emitFacade to true.

Another cool thing about EventTarget, if you fire an event without publishing it, it will get published for you. If you rely on automatic publishing, I think the event always gets published with default parameters. If your object extends Y.Base, you're in luck because emitFacade defaults to true.

Here's another example of using nested views and custom event bubbling: http://jsfiddle.net/3HTzA/

I like to publish events within the initializer method just because it gives me a handy place to keep track of all my events, but notice that you can comment out the publish and the event bubbling still works.