Hi,
I have a model object binding in a form.
By default a Boolean value is showed like a radio button.
I need that this Boolean value binding to a ComboBox or similar that supports 3 values (null, true, false) showing in the ComboBox ("", "yes", "no").

This can be very useful in the Data Editor to do filter. With the default implementation I have problems, don't support null.

I try to do that, but I don't have success.

Can any give me an idea

PD: sorry for the bad english