[Zope] Python product - inherittance

Hi Zopists, I have a problem with inherittance of my publishable python classes. I created in python classA and classB(classA) classA has functionA and classB has functionB. In __init__.py of my product I register only classB. My problem is that it is not possible to call functionA of an instance of classB. There is 'Error Type: AttributeError'. Does anybody know where the problem is? I use Zope 2.1.6 Thanks, Petr -- Petr Knápek NEXTRA Czech Republic, s.r.o., Hlinky 114, 603 00 Brno, Czech Republic e-mail: knapek@nextra.cz