>Sure, I want to add a class to a container from within
>a builder. The user can add and remove other objects
>using the builder.

It can be done. In fact, Mere Mortals framework does just that by opening the vcx file and manually adding in the information into the table. I am not sure that you can do that if the vcx is open, but I'm sure you can script something along those lines using intellisence.