[Zope] ZClasses and automatic sub-objects

[Tim Moore]

I have an ObjectManager-derived ZClass.  I would like all instances of
this ZClass to have a subobject added to them automatically at
creation time.  This subobject has a fixed id in each instance (in
this case, I want to add Image objects with an id of "logo").
Preferably, this object would a permanent part of each instance...you
wouldn't be able to delete or rename it in any instance, but you would
be able to edit it (e.g., upload image data).  So, essentially it
would act analogously to a property sheet.  Is this even possible?  I
asked this question a couple of weeks ago and never got a response.
-- 
Tim Moore