Returns the arbitrary keyed-data specified by the given key.
Original signature is '+ (id)valueForKey:(NSString *)key'
Available in Mac OS X v10.5 and later.


- key (NSString)
- The name of one of the receiver's properties.

The value for the data specified by the key.

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