[Zope] calling product methods

Hello, whenevver I try to call a method wich should be acquired from the product I get a traceback. I have a Yihaw folder. In the Yihaw Product there is a method YihawNewsItem_add. But when I try to call <dtml-with news> <dtml-var "YihawNewsItem_add(REQUEST=REQUEST,RESPONSE=RESPONSE)"> </dtml-with> or <dtml-var "news.YihawNewsItem_add(REQUEST=REQUEST,RESPONSE=RESPONSE)"> I get a traceback telling me that YihawNewsItem_add is not known. What is wrong in my picture of how products work? Thanks Ulrich -- Searchengine Know How - Webpromotion - Optimization - Internal Search World Wide Web Publisher, Ulrich Wisser, Odensvag 13, S-14571 Norsborg http://www.publisher.de Tel: +46-8-53460905 Fax: +46-8-534 609 06