[Zope] dtml-tree bug?

Hi, I was just testing some things with Zope and came probably across a bug: This works (I don't want the 'Catalog' to appear in the list): <dtml-tree branches_expr="objectValues(['Folder'])"> <dtml-var id> </dtml-tree> Unfortunately calling this page with '?expand_all=1' causes the thing to fail on 'KeyError', 'branches'. I tried some hacking but the only result I got was an always collapsed tree. Is this a known error? Ondrej -- Love is staying up all night with a sick child, or a healthy adult.