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    We don't know, and we don't want to know. The integration between Core Animation and the view hierarchy is an implementation detail and could change at any time if Apple thinks of a better way to do it. :) Commented Sep 28, 2011 at 12:20
  • It's really not clear what you are asking here. "How does these buttons are drawn?" is really vague. If you just want to know how it all works internally, you won't find out here, because that's secret Apple sauce. Commented Nov 1, 2011 at 19:28
  • Yes I was looking for some internal details. May not be all.. but some nice discussion around the area, some ideas, some clues can reveal the mystery. Commented Nov 3, 2011 at 9:40
  • The title of your question indicates that you are interested in mixing Quartz/Cocoa drawing code with 'native' OpenGL drawing code. Is that what you are actually interested in? If so, this question is probably already answered here (without having to know about secret Apple code.) Commented Nov 20, 2011 at 14:26
  • This question is for "other way around": http://stackoverflow.com/q/8214884/963550 Commented Nov 28, 2011 at 14:41