[Zope] hasattr

Hi all I've created a Python Script like class with Catalogawarness and PropertyManager as super classes too My problems begins when I try to know if these objects has some properties. If I try these: hasattr(object.aq_explicit, 'someproperty') the function returns false but when I go to ZMI to object's properties form I could see the property someproperty Can you help me? Thank a lot!!!