(My apologies if You already got this via Zope-forum. I'll avoid double-posting in the future.) I want to give the user the following functionality: 1. From some folder deep down the directory tree ("start folder") she/he may open a tree-view with the root at this start folder. 2. Interactively, she/he may create tree-views with the root shifted up by one or more levels up to the root of the Zope-tree (or wherever the rights allow). I tried to code this the following way: In the root folder there is a dtml-method called "show-tree" which does essentially this: <dtml-tree expr="REQUEST.PARENTS[uplevel]" skip_unauthorized=1 branches_expr="objectValues(['Folder','File','DTML Method','DTML Document'])"> <a href="<dtml-var absolute_url>"> <dtml-var title_or_id> </a> </dtml-tree> This method is called from the "start folder" in essentially the following way: <dtml-var standard_html_header> <dtml-unless uplevel> <dtml-call "REQUEST.set('uplevel' , 0)"></dtml-unless> <dtml-call "REQUEST.set('uplevel', _.int(uplevel))"> <dtml-call "REQUEST.set('uplevelp', uplevel+1)"> <a href="<dtml-var URL0>?uplevel=<dtml-var uplevelp>">Up</a> <dtml-var show_tree> <dtml-var standard_html_footer> This works OK. However, if - after having pushed up the tree-root by some levels - I want to expand or collapse one of the branches by using the +/- - icons, the tree is displayed with "start folder" as root again, instead of the folder where I tried to expand/collapse the branch. ("expand/collapse all" works!) How do I avoid this? Thanks in advance!