Events propagate through the hierarchy of objects.  If necessary, you can stop 
them (cancel them) once they get to a certain point in the propagation.

http://livedocs.adobe.com/flex/3/html/help.html?content=events_08.html

Specifically, the section on Bubbling answers your question.

--- In [email protected], "markflex2007" <markflex2...@...> wrote:
>
> The format for Event constructor like this
> Event(event_type:String, bubbles:Boolean, cancelable:Boolean)
> 
> I do not understand what the "cancelable" used for and how to use  it.
> 
> Please give me a idea.
> 
> Thanks
> 
> 
> Mark
>


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