Semi-related to my previous post, I just filed rdar://7577360 (text below).  As 
far as I can tell, it's a bug in the docs.

--Andy


The "Overview" at 
<http://developer.apple.com/mac/library/documentation/Cocoa/Reference/ApplicationKit/Protocols/NSUserInterfaceValidations_Protocol/Reference/Reference.html>
 says: "To validate a control, the application calls validateUserInterfaceItem: 
for each item in the responder chain, starting with the first responder. If no 
responder returns YES, the item is disabled."

>From my experience, this is not what happens.  Rather, it works the way Jakob 
>Olesen describes in this post on cocoa-dev:

<http://www.cocoabuilder.com/archive/cocoa/168662-validateuserinterfaceitem-and-chaining-actions.html>
"1. Find the target for my action
2. Validate using that target and nobody else."

I.e., validateUserInterfaceItem: does not go up the responder chain until it 
gets a YES answer; it goes up the responder chain until it finds a target that 
responds to the action message, meaning the docs are incorrect.

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