CellTree expand with CompositeCell - Example or HowTo?!

Hi there, 

i want to use the CellTree to show the hierarchy of my data in a tree structure. For beginning took a look at this example  http://code.google.com/intl/de-DE/webtoolkit/doc/latest/DevGuideUiCellWidgets.html#celltree to understand how a CellTree works. This works!!!

But now I want to expand the leafs with further information, like a description or a checkbox. It should look like this http://gwt.google.com/samples/Showcase/Showcase.html#!CwCellTree. Because I'm new to GWT I don't know how to realize it. Could someone give me a hint or a short example?

Thanks Alex

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