[Zope] Zclass and Permissions: Delete Instances?

hi@all, ok - there is an "Add ***" permission mapped to "Create class instances" per default. i also know how to create a new custom permission in the product´s folder, how to add it to the zclass "Class Permission" and how to map a zclass-propertysheet´s "Manage properties" permission to my custom permission. but is there also a possibility to map the "Delete Objects" permission regarding a certain zclass to a custom permission? /wolfie -- http://www.t0.or.at