This example here :- http://www.zope.org/Members/anthony/tree-coding-tricks with the external method class _dummy: def __init__(self, name): self.name=name def child_lookup(parent): c = [] for i in range(0,5): c.append(_dummy("%s.%d"%(parent, i))) return c and dtml method <dtml-let name="0"> <dtml-tree id=name branches_expr="child_lookup(parent=name)"> <b><dtml-var name></b> </dtml-tree> </dtml-let> appears not to work on zope 2.2.0 or 2.1.6 on RH 6.2 with netscape 4.7x, python 1.5.2 Every node gets the label "0" and then stops expanding. I also tried a simple example starting with a root of 1 and computing leaves of 2x and 2x+1 but that also fails. Any ideas what is goind on? Jon