GWT Designer and tree widget problem

Hi,

I'm working with Eclipse Helios, GWT plugin and GWT Designer
installed.
I made my interface ( many panels, textbox, buttons etc...).

When i try to add a Tree widget, the result is an exception in
Eclipse.

I try to find precisions about tree widget in documentation, but i
didn't find anything.

Could you help ?

Thanks.

Regards.
Karim Duran.

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