[Zope] dtml-tree: wrong branchesexpanded/collapsed

[Ulla Theiss]

Hello List,

I've a problem with dtml-tree.
When I click on the first "plus sign" the branches may be expanded, or 
nothing may be happen or one of the other branches may be expanded. The 
same behaviour occurs with the attempt to collapse or expand the other 
branches.

Dtml-code:

<dtml-tree branches="getBranches">
    branch:
   <dtml-var expr="__str__">


Product-code:

class TestBranch:
    def __init__(self, str= "a"):
        self.str = str

    def getBranches(self):
        if not "x" in self.str:
            return [TestBranch(self.str + "x")]
        else:
            return None

    def __str__(self):
        return self.str

    def getBranches(self):
        return [TestBranch("a"), TestBranch("b"), TestBranch("c")]



Do you have an idea, what I make wrong?

Many thanks in advance,
Ulla.