Graphical representation of a tree

Hello,

I want to represent a Tree in a antoher way as the standard graphical
representation.
Drag & Drop should be able.
Like this one:
http://s1.directupload.net/file/d/2603/yzo588bb_jpg.htm

Do you know a good GWT Extension to realize this?
I have already looked at the Google Web Toolkit Gallery.
Do you think something like this would solve the problem?
http://gwtgallery.appspot.com/about_app?app_id=86

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