[Zope] Create ZClass instance from python

Hi, I've created a product ("myItem"), containing a zclass "ItemType" with base class objectmanager. The python code is like this (got from some internet sources): context.manage_addProduct('myItem').ItemType_add(_.None,_, Redir=1) By executing the code there comes the error: "ItemType not defined". ???????? Anyone may help me ? Thanks !!! Grettings Hans ----------------------------------- Dipl.-Ing. Hans N. Beck Waldstr. 28 75045 Walzbachtal Tel: 07203/922280 Mobil: 0177/5383233 -----------------------------------