UiHandler w Custom Events

Does anybody know of a way to get this to work. I'm running into this issue where ive created a custom event which is fired by a widget. The parent of that widget is listening for the event via:

@UiHandler("childWidget")
void onMyCustomEvent(CustomEvent event) {
 //bla blah
}

However, compiler complains that 'childWidget' does not have an "addCustomEventHandler" method (which it most definitely does) b/c i'm able to add the handler programatically, just not via UiHandler,

https://groups.google.com/forum/#!msg/google-web-toolkit-contributors/cy44bYEAtKs/DHKeyTP5MhcJ

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