[Zope] overriding manage methods

In my Z-Class I would like to hook various standard methods in a dtmlish way. The frame work would call my dtml method say manage_delObjects and within that method I would like to call the original manage_delObjects. I guess this must be a very standard requirement as I see that there are methods called afterAdd and beforeDelete etc in the object manager. I just don't know the proper namespace magic to override and eventually call these. -- Robin Becker