title: Extjs4 pie chart problem
body: <p>I am facing following problems with the <em>Extjs4 pie chart</em>:</p>
  
  <ol>
  <li>I am unable to change pie chart colors</li>
  <li>I want to disable legend (not clickable)</li>
  </ol>
  
  <p>please help me..</p>
  
  <p>thanks</p>