[Zope] ZClass-Inheritance Problem

[Stadtverwaltung Schwarzenberg]

Hi there...

i have a ZClass (name: class1) and another ZClass (name: class2) which
inherits from class1. Class1 has a dtml-method called doSomething().
Instances of class2 are supposed to use this method in an extended way which
would look like this:

<dtml-comment>doSomethingMethod of class2</dtml-comment>
<dtml-call doSomethingOfClass1>
<dtml-call doSomethingElse>

My question is: how can I make a method of class2 call its parents method?

Thanks

Falk