[Zope] Workaround for objectValues security problem?

Hi, I'm trying to create a navigation bar DTML Method that goes something like this: <dtml-let root="PARENTS[-1]"> <dtml-in "root.objectValues('Folder')"> . . . The problem, as reported in a posting from Jerome Alet last week, is that the Anonymous user does not have permission to access the objectValues method. Giving the navigation bar DTML Method the proxy role of manager does not work correctly: the method can be called directly but not within other documents or methods. Does someone have a workaround for this problem? Thank you.