Flipping a Window in Cocoa

Question

How can I flip an NSWindow so I can press a button, and the window will "flip" like on Dashboard and the content view of the NSWindow changes.

Answer 1

Step 1: Center the window on a vertically-aligned fulcrum.
Step 2: Push down on one side.

OK, that's not it. ☺

Mike Lee wrote one, and put it in the public domain. Rainer Brockerhoff wrote one, too, and put his under an MIT license. So you have your choice.