[Zope] newbie:zope product making

hello all made myself a python class. works in the command line. to zopify it, i made it subclass Folder. everythings great. except that, after instantiating the product, i can't add anything in it. what should i do to make this possible? i've even inherited(?) Folder.Folder.__ac_permissions__ sorry if this is too obvious. but it eludes me. thanks.