I've already submitted this to the collector, but I wanted to make sure that I'm not the only one with this problem. Using the CVS Zope, if I create a ZClass, I am unable to add a Property Sheet because of an error (missing "__len__"). I find it hard to believe that I'm the first person to try to add a ZClass in 2.2, but I didn't see this in the collector. Kevin http://www.byproducts.com - Humor and Novelties