title: Change cell's color in isCellEditable method of ExtJS
body: <p>I need to change the cell's color if the cell is not editable.</p>
  
  <p>I do not want to user renderer for this since i am doing lot of validations in isCellEditable method.</p>
  
  <p>If I call isCellEditable method from renderer two times this method would be called and it would be a perforamance hit.</p>
  
  <p>Any help is appreciated.</p>
  
  <p>Below is my code:</p>
  
  <pre><code>var grid = new Ext.grid.EditorGridPanel({
  
      store: store,
  
      id: 'editorgrid',
      columnLines : true,
  
      //more properties..
  
      cm: new Ext.grid.ColumnModel({
          isCellEditable: function(colIndex, rowIndex) {
              if(colIndex == 1) {
                  //before returning false I want to change the color of this cell i.e want to make it grayed out    
                  return false;
              }
          }
      })
  });
  </code></pre>