Drag drop title window over Canvas?

i am trying to catch the dargOver and dragDropped event on canv开发者_如何学运维as.. for titlewindow. but moving title window over the canvas does not fire these two events ? is there any solution ?

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You can catch those events on Canvas See here http://livedocs.adobe.com/flex/3/html/help.html?content=dragdrop_7.html

Canvas inherits EventDispatcher.