title: Interface Builder (iPhone dev) custom button background Image does not respect Stretching settings
body: <p>I'm attempting to create a custom button using a background image in Interface Builder.  The image has stretchable and non-stretchable parts so that it can be resized.</p>
  
  <p>IB exposes the Stretching properties to allow for this, yet no values I put in affect how the button appears.  It is always fully stretched to fill the size of the frame.</p>
  
  <p>Is this this a unsupported feature in IB or in UIButton perhaps?</p>
  
  <p><a href="http://img.skitch.com/20100103-rjabkq2c2jkqynw47crxepdtwb.jpg">http://img.skitch.com/20100103-rjabkq2c2jkqynw47crxepdtwb.jpg</a></p>
  
  <p>(Note: The above stretch values are not the ones that will work with the image properly, but just the values I was messing with at the time of the screenshot)</p>