[Zope] Folderish documents

I'm hacking on ZWiki, trying to create a subclass of the ZWikiPage which acts as a folder which can contain other ZWikiPages. Much of the work for this product is done. It behaves folderish, items can be added, management tabs appear . . . but the contents of the folder don't appear. Instead, I get a message saying something like: 'There are no items in <string>' even if contents are a) added and b) viewable. I really don't know what could be causing this, whether the error is in me, ZWiki, or OFS. I don't receive any errors, but this contents problem has bugged me for days, and I don't have any leads on a solution. What additional information can I provide? Can anyone offer any suggestions? Thanks.