OK, I've found that this may be a bug. You can't subclass ZClasses across products. Sorry. I have no "esimated time to resolution" for this either. For now, you should be able to create a subclass of STX_Document inside the product to which it belongs and work from there. John Morton wrote:

ZClass based products already present are webDirectory (my own creation) and STX_Document. I create a product and add a vanilla ZClass to it, then create another product and add a ZClass. In that dialog I put Catalog Aware across, then DTML method, then I drop DTML method. The Base class list contains the same selection of bases - no Zclasses among them.

Same deal under 2.1.4. I think debuging mode is operating on the both of them, for what it's worth.

Which bit of code should I start looking through, first? :-)

-- Chris McDonough Digital Creations Publishers of Zope - http://www.zope.org