Associate objects with Tix.Tree

[Wolfram Kraus]

Heyho!
I want to associate objects with the nodes of a Tix.Tree. Is this 
possible, because the following example won't work:

--8<-- Cut here -------------------------
import Tix
class C:
    pass
root = Tix.Tk()
top = Tix.Frame(root, relief=Tix.RAISED, bd=1)
tixtree = Tix.Tree(top)
tixtree.pack(expand=1, fill=Tix.BOTH, padx=10, pady=10, side=Tix.LEFT)
c=C()
print c
tixtree.hlist.add(c,
                  itemtype=Tix.IMAGETEXT,
                  text='foo',
                  image=tixtree.tk.call('tix', 'getimage', 'folder'))
tixtree.setmode(c, 'open')
root.mainloop()
--8<-- Cut here -------------------------
Can this somehow be done?
TIA,
Wolfram
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