NSWindow zooming "into view" (first tiny, then zooms to normal size)

Does anyone here happen to know how to accomplish this effect from Espresso.app?

http://f.cl.ly/items/1j1V1q322f2K202v2T2s/ScreenFlow.mov

Notice how the title bar also starts off tiny.

Do you happen to have any code on hand?开发者_运维问答 Or some general idea of how it would be best to do this?

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I found another post which contained my answer: Cocoa - NSWindow animation when displayed?

See also my comment there. That was also crucial for making this work properly.