[Zope] [Zope product] How to register an icon for an abstract superclass ?

[Sinclair]

Hi all,

I aim to have a ZMI icon shared by many classes who inherit from the same
superclass.

As I didn't want those class appear in the ZMI "add object" choice list, I
didn't register them in the .init file.

Well, how to register only the icon in association with the superclass,
without registering constructors ?

Sinclair