>The reason to add bizobjs to a container is to allow single point generic calls in the framework without adding bizobjs to form, as a framework I saw does.

Why is this a bad thing? Adding relevant business objects to a form (or creating them in code form the form) makes a form self-contained and more portable.

A single business object for each entity for the entire application also does not scale for an app that needs to open multiple copies of the same form, sort of like the difference between private datasessions, the default datasession.