[Zope-dev] how to call overridden method of super-zclass?

Hi there, Imagine I have two ZClasses, ZClass A and ZClass B. ZClass B derives from ZClass A. Now if ZClass A has a DTML Method 'foo' and I override this DTML Method inside ZClass B, how can I still access this method from within the overridden method? Basically I want to refine methods, keeping the functionality of the superclass but adding some new functionality of my own. Regards, Martijn