title: How to use CAGradientLayer?
body: <p>I'm getting up to speed with the new APIs introduced in OS 3.0, especially the cool new improvements to Core Animation (mostly on CALayer etc...). Now I'm trying to figure out how to use CAGradientLayer. It looks simple at first, but the NSArray it requires for the colors property must contain CGColorRef (according to the header file). I've tried casting to (id), but then the NSArray seems to contain NSCFType objects, which doesn't sound good.</p>
  
  <p>Anybody figured how to use it or could point to some good code samples?</p>
  
  <p>Thanks</p>