Hi, I've come across the need for this a few times now and I'm wondering if there is/should be a better/standard way of doing it. Basically, there seems to be a 'type' of object which basically does something and then calls another (specified per instance) method. Examples: Site Access Rule - Calls the specified method before traversal Mail-in Client - Calls a specified method when an incoming email is recieved for the appropriate address. There was another one too but I can't remember it :( The way SiteAccess did this wasn't pretty but seemed like the right idea. I'm more inclined to do this with a seperate object that has a dropdown list for you to choose the method from. Anyone know hwo I can do this? Any other comments? Chris _______________________________________________ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )