Could someone help me understand adding adding ZClasses a bit further? First I had a problem with nested ZClasses, which got me into trouble when I wanted to add ZClasses to each other. So I followed the 'common wisdom' of adding all ZClasses at the top level of the product. THis generally works OK, and you can add ZClass instances to each other from the management interface. So far so good. WHere things go wrong is by recursively adding ZClasses, as in: the following pseudo code for ParticularZClass with some NestedZClasses inside: (<Particular ZClass> constructor has the following action sequence): create ParticularZClass instance set some properties in somelist set some other properties into REQUEST create NestedZClass instances whatever reading and following every piece of documentation I could get on this (not much), I never got any further than adding the NestedZClasses instances on the _same_ level as the ParticularZClass. No <dtml-with "manage_addProduct['whatever']"> (which contrary to documentation should have the containing product and not the ZClass as the 'whatever' argument) could help me out. The only workaround is to create the ZClass in an auxiliary product, in which case the recursive adding does work. Could someone explain what is happening here (apart from that it's a bug)? And yes, I'll add it to the Collector. Rik