title: How to detect when iPhone MPMoviePlayer controls appear/disappear?
body: <p>I'm trying to add custom buttons to the left and right of the standard rewind/play/forward controls in an MPMoviePlayerController view (OS 2.x and up).  I've figured out how to add them to the player window, but they're always visible.  Is there a way to detect when the standard controls appear and disappear?</p>