Hello, here's a nice link about ZClass-properties-> http://www.zope.org/Members/lstaffor/zProperties and at the end there are more links or search on zope.org for zclass. Short description of the way: create product->create zclass-> create property-sheet->change manage_add method ->build form (with your html-select-box)->build add_method ->that's all With a little routine , you manage to follow this steps and build a basic class with no layout in 1 hour. Mit freundlichen Grüßen With kind regards Sven Hohage