I have created a preference pane that allows the user to select a QTCaptureDevice. In Interface Builder, I bind a KVC-compliant method in my model class that retrieves an NSArray of QTCaptureDevices to an NSArrayController, which is in turn bound to an NSPopupButton. This all works; the list of QTCaptureDevices appears in my NSPopupButton and the selected device may be retrieved e.g. by an NSLabel's value property bound to the ArrayController, key selection, Model Key Path uniqueID; now I want to store that uniqueID into User Defaults for my application. The User Defaults object in InterfaceBuilder, however, doesn't expose any way to bind values from the Binding panel in the inspector (as I bound my NSLabel). What's the best way to do this?