On Dec 2, 2009, at 11:43 AM, David Hirsch wrote:

That did indeed solve the problem. Are there docs (other than the official ones, which in this particular area are inscrutable to me) that discuss this idea of a proxy? I'd like to know more on this topic, so as to avoid similar problems in the future.

Read the KVO guide, including the part about KVO compliance:

http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/KeyValueObserving/

Also, see the bindings troubleshooting page:

http://developer.apple.com/mac/library/documentation/cocoa/Conceptual/CocoaBindings/Concepts/Troubleshooting.html

Cheers,
Ken

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