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Looking for best practices for sending data/events between composites

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I currently have a small GWT 2.2 project broken out into several
Composites and DialogBox subclasses. In particular, I have a sub-
class of DialogBox that contains a FormPanel (but it doesn't have
to). On this form, I am collecting some data that, once "submitted",
needs to be passed up to the parent.

I see getParent().fireEvent(), but this only contains very basic data
about the event. I actually want details of the form, or perhaps to
construct my own event and then fire that off.

I have seen some discussion of EventBus but this looks particular to
MVP, which I do not plan on using.

Therefore, I am looking for any tips/suggestions on how I would best
accomplish this task.

Any help would be appreciated; thanks.
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