[Zope] Setting permission when installing a ZClass product

Hello, I've made a ZClass product, with some permissions. When you add the product the permissions are there but without any default setup for the roles. Is there a way to have a 'setup' method when installing a Zclass product (i know i can do that with a method by hand, but i want to avoid ask the product user to do it). Any idea about doing that the smart way ? Thanks.