title: NSProgressIndicator's setControlTint has no effect
body: <p>I have a very simple task: change the NSProgressIndicator's color into graphite when the progress is paused by user, that is a determinate progress bar. I found the method <a href="http://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSProgressIndicator_Class/Reference/Reference.html#//apple_ref/occ/instm/NSProgressIndicator/setControlTint%3a" rel="nofollow">setControlTint</a> but after using it there is just no effect. I also searched a lot there is not much clear answers. Is subclass NSProgressIndicator and do some custom drawing a must? I just wonder why this method there and no further document or discussion about proper usage. </p>
  
  <p>Thanks a lot for any help :)</p>