This action method simulates the user clicking the close button by momentarily highlighting the button and then closing the window.
Original signature is '- (void)performClose:(id)sender'
Available in Mac OS X v10.0 and later.


- sender (Id)
- The message’s sender.

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