[Zope-dev] method attribute __roles__ in Zope 2.8

I can across the following problem while trying to fix the broken FTP service for Zope 2.8: ObjectManager.manage_FTPstat() tries to access self.manage_FTPlist.__roles__ whose value is ('Manager',') in Zope 2.7. In 2.8 this attribute is not available. Can someone explain how and where is attribute in set Zope 2.7 and why it is no longer available in Zope 2.8 (has it anything to do with new-style classes in 2.8). Being-completely-clueless, Andreas