Create a custom CollectionEditor Form for use with the PropertyGrid?

I am trying to incorporate a PropertyGrid control based off of the CollectionEditor class and Form, with a class that has a list/collection of another class as one of the properties. Lets call them class A and the list would be containing class B for reference.

I was wanting to incorporate a form that had two list boxes. The list box on the left would contain a list of all of class B's in my program that are not currently in the list on the right. The list on the right would contain all of the class B's that are currently associated with class A. I want buttons in between to move items between the two lists.

This would be easy to design, but I'm not sure exactly how to set up the form to be used as the collection editor.