[Zope] dtml-tree

Hi all !! I'm trying to use the dtml-tree tag for displaying my folder site structure ! The problem is that i want to display only a part of my site structure, so i have tried something like this: <dtml-with "PARENTS[0].SITE.DIR1.DIR2"> -> Path from where i want to show the structure <dtml-var browse> -> the DTML-method that does the display of the tree </dtml-with> the funny thing is that, if i do a view in zope of the DTML-method browse directly it works, but it fails when i call the method from other place. Has anyone had a similar problem ? thanks for all effort, and best regards Nuno