title: How to change color of progress bar as it progresses?
body: <p>It would have been easy with Flex 3 using <a href="http://polygeek.com/813_flex_changing-the-flex-progressbar-from-red-green" rel="nofollow">barColor</a> but as barColor is no more available in Flex 4 how can I setup progress bar such that the progress fluid changes it's color with progress.</p>
  
  <p>Like starting progress with the shades of lighter green and ending at bright red.</p>