GWT CellTree with an optional pop-up menu triggered on click of a TreeNode

I've dug though all the documentation and samples I could find but
cannot find a solution.

I've looked in the obvious places like here:
http://code.google.com/webtoolkit/doc/latest/DevGuideUiCellWidgets.html#selection
and here: http://gwt.google.com/samples/Showcase/Showcase.html#!CwCellTree

Perhaps an expert on CellTree can help me?

I have already posted my inquiry (with the same title as this post)
here: http://stackoverflow.com/questions/8843405/gwt-celltree-with-an-optional-pop-up-menu-triggered-on-click-of-a-treenode

If you don't mind a cross-post here, I would really appreciate some
help!

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