title: How to add class to column of grid with angular-ui-grid?
body: <p>I'm working with UI-GRID and have to add the custom CSS to the header of the grid, so I'm trying to add class to columns.</p>
  
  <pre><code>$scope.columns = [
  {
    name: 'status',
      displayName: 'STATUS',
      width: 200,
      pinnedLeft: true,
      **cellClass : "gridColumnStyle"**
  },
  {
    name: 'serial',
    displayName: 'SERIAL#',
    width: 200,
    cellClass : "gridColumnStyle"
  }, 
  {
    name: 'product_name',
    displayName: 'PRODUCT NAME',
    width: 200,
    cellClass : "gridColumnStyle"
  }
  ];
  </code></pre>
  
  <p>But it is not working. Please tell me how to add the class which have some custom style.</p>