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I have a video it's explaining better than I can 🙂
http://dl.dropbox.com/u/7017985/VID_20120825_110527.3gp
My Hardware is: rMBP (MC975LL/A)
My Sofware is: 10.8
My Flash version is: 11.3.300.271
And video was played in latest Safari browser.
MacBook Pro with Retina display, OS X Mountain Lion (10.8)