Thanks Kevin.
I forgot to mention that I'm writing in VB. With some modification the code works as an individual class within the project. As long as one registers BizObjs via a creator routine, your designer will 'see' them. I have some questions about the designer that appears when one invokes it from the BindingSourceMember on a control's property page, but I'll save them for later.
I experimented with instantiation & registration along with setting the BindingSource and BindingSourceMember properties in code NOT related to the constructor. This works fine, so far, and will come in handy as I have a 7-tab affair comprised mostly of children to the main entity that I want to pseudo-lazyload only if a user clicks on a tab rather than load the whole thing at once.