[Zope] Creating an object from within another

So far so good, Next hurdle, at least the problems have been cut down to hurdles from walls. I have a folderish product say myFolder, in the manage_addMyFolder function I want to create an object of my product B. so I do this: def manage_addmyFolder(self, id, title='', REQUEST=None): """Add a new myFolder object with id *id*. """ ob=myFolder() ob.id=id ob.title=title self._setObject(id, ob) try: user=REQUEST['AUTHENTICATED_USER'] except: user=None ob.manage_addB(id='index_html', title='') <-- if I change this to ob.manage_addDTMLDocument(id='index_html', title='') that works ????? ....... I get the following error: AttributeError: manage_addB Any thoughts, DR