title: How can I set NSSegmentedControl background image?
body: <p>I want to set the <code>NSSegmentedControl</code> background image not the icon image.I subclass the <code>NSSegmentedCell</code> and rewrite the <code>drawSegment: inFrame: withView:</code> function.But this works bad.How can I do that?</p>
  
  <p>update:
  I want to set the half rect dark or light color background image.</p>