I don't have time to try it out with GWT, sorry, but just to add some input to the possible issue: mouseover and mouseout events bubble, so if your mouse enters a child element of the B widget's root element, the event will bubble up to B's root element. GWT filters those events out in Widget#onBrowserEvent's default implementation to somehow mimic IE's (and now HTML5's / DOM3 Events') mouseenter and mouseleave events: http://code.google.com/p/google-web-toolkit/source/browse/trunk/user/src/com/google/gwt/user/client/ui/Widget.java#163
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