[Zope] images within property sheets

Hi everyone, Can one add dtml methods within property sheet fields which will work? I add images (dtml-var) inside an object and try to reference those images in that objects property sheets (a text field), but I can't do it. (For that matter, I can't add any dtml script in my property sheets, so I must be missing something conceptual here) Via property sheets, the only images I can reference are the images that I am storing in Apache or elsewhere. Any answers very much appreciated. Thanks in advance. Tom