[Zope] Assigning Permissions to User Roles

Hi ! I have a product that uses userroles to set certain permissions on objects. i added user roles to my product (MUSHandle is the actual instance of my Product) with this: data=list(MUSHandle.__ac_roles__) data.append('Kunde') data.append('Vertriebspartner') data.append('Executive') data.append('Verwalter') MUSHandle.__ac_roles__=tuple(data) but when i try to assign permissions to my roles : AccessControl.Role.RoleManager.manage_role(self,'Verwalter',['ChangeMuS']) I fail :( Any suggestions?? Bye, Alex