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NSPopUpButton content bindings - item enable state

I ran into a possible gotcha...

I have some NSPopUpButtons which use bindings to populate themselves from a model object, and update their selected item based on selectedObject being bound to an NSArrayController's selection. The content is the model array of objects, and the content values are the objects' name property.

The model objects can become disabled, and I want to enforce the disabled state of the NSMenuItem in the popup button. Currently, the button items just use a SKWBooleanColorTransformer to draw the themselves with the appropriate disabled control color, but they are still selectable (which isn't really a problem, in fact).

Is there some way to perform selection validation, or should I manually disable the items?
--
Shaun Wexler
MacFOH
http://www.macfoh.com
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