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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