[Zope] Simple DTML Method/Acquisition problem

I have a standard_html_header/footer pair which works much like that on zope.org. The header inserts a <!--#var sidebar--> in the left column. The sidebar DTML method is: <!--#in expr="objectValues(['Folder'])"--> <!--#if hidden --> <!--#else --> <a href="<!--#var id-->"><!--#var title--></a><p> <!--#/if --> <!--#/in --> (show links to sub-folders which don't have the 'hidden' property set). The above works fine in the toplevel folder. In the subfolder, however, nothing shows up, even though there are two folders which do qualify. I'd tried originally to have it be a DTML Document and change the expr to _.objectValues(['Folder']), but that doesn't work at all. What am I missing? --david