[Zope] Programmatically creating instances of a ZClass

I have a Zope Product 'MyProduct' that defines a ZClass 'MyZClass'. I'd like to create instances of this ZClass in a python script. I couldn't find any info on how to do that in 'The Zope Book'. I tried something like: myObject=Container.MyFolder.manage_addProduct['MyProduct'].manage_addMyZClass(id=myId) but it didn't work. Any help will be appreciated. --Borislav