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Trivial Bindings question



I'm just getting my feet wet with bindings.
I want to cause an NSButton to enable/disable itself, depending on whether a neighboring NSTableView has a selection or not. I tried hooking it up in Interface Builder, but I just got exceptions when I ran it.
Is there sample code which would demonstrate this, or something reasonably similar?
Thanks :)
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References: 
 >Key-Observing, change, and NSNull (From: Edwin Vane <email@hidden>)
 >Re: Key-Observing, change, and NSNull (From: Edwin Vane <email@hidden>)



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