[Zope] Help! Python?

Hi, I'm still strugling with the manage_afterAdd method. Since Zope always tells -at the line CatalogAware.manage_afterAdd- the object CatalogAware doesn't exists, I'm now trying to import the CatalogAwareness.py file. So far, so good, it now imports the CatalogAwareness file. However, I still get this stupid message the object CatalogAware doesn't exists, etc... This is driving me crazy! Somebody an idea? Tom.