Sent to the delegate to determine whether the action should be enabled.
Original signature is '- (BOOL)shouldEnableActionForPerson:(ABPerson *)person identifier:(NSString *)identifier'
Available in Mac OS X v10.3 and later.

C# | Visual Basic | Visual C++ |

YES if the action is applicable; otherwise, NO.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)