[Zope] how to iterate over the properties/methods in a ZClass

I have a Product with a ZClass called A it holds several B Objects ( in the ZClass definition) i tried to add a method in the A ZClass definition that iterates over the B Objects : <dtml-in expr="objectItems('DSFormField')"> <dtml-var sequence-key> </dtml-in> which works well, but returns the objects only in the Folder of my inserted Object, not the Folder of my Classdefinition So how can i iterate over the /Control_Panel/Products/A/A/propertysheets/methods ? I would like to have a method that lists my DSFormFields that are in the ZClassdefiniton, please help! Thanx Dorian