Posted whenever an NSWindow object resigns its status as key window.
The notification object is the NSWindow object that has resigned its key window status. This notification does not contain a userInfo dictionary.
Available in Mac OS X v10.0 and later.
Declaration Syntax Version Information- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)