mozilla-appmaker/appmaker — pull request #629 by flukeout (2013-11-27 19:41:10+00:00)
Title: Broadcast visualisation as a polymer element.

I need help figuring out one piece though, for some reason the element gets added to the page somehow when the designer loads. Subsequently, the "broadcast" event gets triggered twice when a component emits something - I don't know how to fix it, please look over and help if you are able.