[Zope] Subobjects question

Consider the following situation (all classes live in a single product and are derived from Object Manager, so have a subobjects-menu) A-B-C a-b-c I want to generate an object of type b in C, so in the subobjects-menu of C I´d like to have a b-object (which does not show up). Is this possible? It would be quite nasty to flatten the hierarchy like A-B-C a b-c b shows up in the global available objects after that, which is not what I want. B.T.W. The exact hierarchy is T+-A-B-C `-a-b-c so everything in T is hidden from the outside, but inside T I`d like to see everything. I hope there´s a solution to that problem, otherwise i`m severely stuck in my class design.. -- Tom