很漂亮的引导标题栏GRGlassWindow

很漂亮的引导标题栏GRGlassWindow源码，源码GRGlassWindow，GRGlassWindow是NSWindow 的子类，该源码案例经常使用在一些应用的引导作用的，并且效果还拥有漂亮的glass-like标题栏。 A NSWindow subclass with a beautiful glass-like title bar. Use the sample app and headers as a guide, more documentation coming soon. Thank you Raffael for the challenge.