Flex tree with checkbox

I'm using a tree to show a filesystem structure.
I have to let users select which "folders" select and which not inisde the tree.
I was thinking to add checkboxes to the tree labels. Is it possible?

something like this?
http://www.sephiroth.it/test/flex/3/treecheckbox/index.html
source:
http://www.sephiroth.it/file_detail.php?id=151#

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