>You certainly can use the formset base class for this as long as the containter is never going to be put in a form. A formset class cannot be put in a form.

Thanks, Jim. Yes, I will never put it in a form. I just wanted to make sure that base class wasn't a bad choice for a non-UI object. It seems, in thinking about it, that Load would be a reasonable event for the language to support for other base classes that can be containers.