Jay,

thanks for your reply!

>If you have all of the component parts of the container class, you could create your own container class in a differently named classlib, using the appropriate combination of framework classes and your own classes -- appropriately named.
>
>This would work if the object is instantiated under your control. If the class is instantiated by the framework, then do you have control through a property, or other mechanism, to ensure your class is used?

There's no abstract parent container without the child object, so there is no chance. I simply copied the class completely. This works for now.

Thanks,
Armin