[Zope] creating a ZClass within a Product with Python

[Markus Jais]

Hi folks,

I hava a litte Problem.
I have a Product written in Python, which inherits from ZClasses.
Now I want to add a ZClass to the Product with Python.
my first thougt was, to simply put
"manage_addZclass(id)"
in the Constructor, but nothing happened (no ErrorMessage, no ZClass
was visible, when I clicked on the Product in the management screen)
Does anybody have an idea how to do this.
Or an url, where I can see an example.

Thank you very much!

Markus Jais