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How to enable/disable buttons immediately after focus transfer

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How to enable/disable buttons immediately after focus transfer

Subject: How to enable/disable buttons immediately after focus transfer
From: an0 <email@hidden>
Date: Tue, 5 Aug 2008 21:36:12 +0800

I know how to do this for NSValidatedUserInterfaceItem by implementing
`- (BOOL)validateUserInterfaceItem:(id < NSValidatedUserInterfaceItem
>)anItem'; however, NSSegmentedControl and NSButton do not conform to
NSValidatedUserInterfaceItem protocol, then how can I switch the
enable status of  these controls as an IMMEDIATE response to the focus
transfer?
Thanks in advance.
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