[Zope] using tal macros in PloneArticle query

Hi all, I am trying to use tal and metal inside of a PloneArticle instance and can not get it to work. Should this not be possible? I am aware that kupu needs to be switched to not strip customg tags on edit and that there are settings which enable or disble content types in the article instance. I did enable the text/python-source type in the PloneArticle settings, but this still seems to not work. Anyone knows what I might be doing wrong? Many Thanks!! Stefan Bartlett Web Systems www.bartlett.ucl.ac.uk