title: ExtJS 4 - How to add background colors to columns of a grid?
body: <p>I have a <em>grid</em> in which I need to provide different <em>background colors</em> to various columns.</p>
  
  <p>These column colors should also not be overwritten by the <code>mouse-over</code> color.</p>
  
  <p>I have tried using <code>cls</code> and <code>tdCls</code> but no luck.</p>
  
  <p>Could anyone guide at how this could be achieved?</p>
  
  <p>Thanks in advance.</p>