[Zope] DTML 'objectValues()' problem

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I have Zope 2.4.0 on a FreeBSD 4.4 release system.  I am trying to use the
<dtml-in "objectValues()" > to get the list of files in a directory ( a
very common thing to do).  But it doesn't work.  objectValues() returns
nothing at all.  In another folder, I managed to write a python script
where I called it drom the context object, and it works then, but not in
DTML.  Now, in a seperate folder, it won't even work in a seperate python
script, better yet from a DTML call.  This is very frustrating, and I
would appreciate any input.  Thanks.

-Dave