[Zope-dev] How to get rid of obsolete Permissions

how can I get rid of the permissions defined for a ZClass, after I deleted the ZClass, all permissions for all ZClasses I ever created are still around and pollute my security or permission management screens. Mit freundlichen Grüßen Joachim Schmitz AixtraWare, Ing. Büro für Internetanwendungen Hüsgenstr. 33a, D-52457 Aldenhoven Telefon: +49-2464-8851, FAX: +49-2464-905163