How to reject a change via bindings - NSEditor?

I have an NSPopupButton on a view that communicates with my model class using an NSObjectController. This is used as part of a remote-control of a radio which means that not all of the options available in the popup button are valid under all circumstances. Unfortunately, it is not known until an attempt is made to set a new value whether or not the radio will accept it.
I have the code that communicates with the radio return a BOOL to say whether the value was valid and therefore accepted, or if it was rejected. If it was accepted, then that is fine. However, if it was rejected, I want to reset the previous value of the popup button.
I've seen references to the NSEditor protocol that has commitEditing and discardEditing messages.
What I want to know is, can this be used with a popup button?
If so, are there any examples showing this protocol being used? (I couldn't find any with a quick Google but I may not have been looking carefully enough).
If not, is there some way to inform the popup button that the change has not been accepted and that it is to return to the previous (or some specific) value?
Thanks
Susan

Answering my own question!
Bindings use KVC as one of their underlying technologies. I implemented a validation method for the variable which was called by KVC. IN my case I could send the message to the radio and see if it was accepted or rejected and pass this back as the validation response. If it succeeded, the KVC code then called the 'set' method which simply recorded the new setting. If the validation failed, then things were automatically reset.
Simple (and obvious) when you have the chance to stand back and think about it (rather than just reacting to a problem!!!!)
Susan

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