hi! i´m just diving into zope product development and have troubles implementing the example "poll" product from the Zope Developer's Guide: my class looks like this: class PollProduct(SimpleItem, PropertyManager): ... i´am initializing my class attributes like this: def __init__(self, id, question, responses): self.id=id self._question = question self._responses = responses before that i define _properties=( {'id':'question','type':'string','mode':'w'}, {'id':'responses','type':'lines','mode':'w'}, ) and manage_options=( #{'label' : 'Test', 'action' : ''}, ) + SimpleItem.manage_options + PropertyManager.manage_options if i click on the "Properties" Tab in the ZMI i get this error Error Type: AttributeError Error Value: question strange...i compared my product with some existing products and can´t find my mistake, maybe you see it with one look tnx in advance!