[Zope-CMF] Adapting ZClass (Compound News Item) to CMF, but state isn't updating in catalog

[ndegrootnl <ndegroot@ktu.nl>]

Using ZClass tutorials, I succeeded in getting the ZClass based 
product 'News item with Images' to update itself in the CMF 
portal_catalog. It now updates when 'Adding' the product and when 
editing the properties. But after 'Publish' the state-variable in the 
catalog does *not* get updated. I tried adding (variations of) 
reindex_object() like

    state_change.object.updateCatalog()
    here.reindex_object()

to a DCWorkflow script, but without success. I also tried to call a 
ZClass method from the script. 
We use the Compound News Item a lot on our site and I would be happy 
to publish the revised version on the CMF Zope-site eventually. 
Rewriting the product into a Python-based product is not an option 
for me...

Nico de Groot
KTU University