[Zope] ZClass direct variable access

Is there a way to access property sheet variables from a zclass method without knowing which property sheet it is contained within. For example, Class A has two prop sheets, S1 and S2 and Var1 is in S2. I can do container.propertysheets.get('S2').getProperty('Var1') or (if I has subclassed ObjectManager)... container['Var1'] The latter form I prefer since it doesn't require knowledge of which sheet I'm really using but it only works if the zclass is based on ObjectManager. In other cases it raises an exception (AttributeError, __getitem__) Any ideas or should this be added to the collector (I've a feeling a basic __getitem__ should be included in ZObject for this type of thing). Phill