Dear Zopers, I recently came back to Zope after a while to find that it changed quite a lot:-) What I am trying to do is quite simple: I have a ZClass based product, with a ZClass in it. After creating the ZClass within the product folder, I can see the new metatype in the drop down list. When I go to some other folder and want do add an instance of that class, wherever and whatever I do, all I get is a NameError: NameError: global name 'tbcontainer' is not defined Tried it in Zope 2.5 beta 2 and 3 and also in 2.4.3. I have combed the documentation and mail list archives for a while without any lead. Could some kind soul please shed some light on this for me. All the best, Christian -- Christian Wittern Institute for Research in Humanities, Kyoto University 47 Higashiogura-cho, Kitashirakawa, Sakyo-ku, Kyoto 606-8265, JAPAN