About the BindingFlag always going back to false in the property sheet after a build, yes I used the DefaultValue attribute, and set it to true. Actually, I just copied in all the attributes for the methods in the Binding Interfaces straight from your source code. Hope you don't mind. ;)

The good news is that when I force the correct form reference to be used in the binding (see my first reply), then the control works fine, even with the BindingFlag problem.

-Nate