title: Style a Spark Component with an Image
body: <p>I'm trying to use an image (embedded) for the thumb on my Spark slider component. This should be straightforward -- I know what to do in mx -- but I haven't been able to find what the Spark syntax is. </p>
  
  <p>I don't even need states (up, down, over, etc) since this is going on a mobile app.</p>
  
  <p>Does anyone know?</p>
  
  <p>Thanks.</p>