title: How to set Extjs.grid.CheckColumn to disabled for read only?
body: <p>I have a grid with check column and check column read my data but i cannot set it,i wondering how to set it with easy way.
  I want my check column to become view only in my grid data how to set it?
  below is my example code:</p>
  
  <pre><code>var chkColH = new Ext.grid.CheckColumn({
      header: '&amp;nbsp;H',
      dataIndex: 'testing',
      resizable:false,
      disabled :true, //***I wan to disabled this check column in my grid for view only
      width: 25
  });
  
  colModel=new Ext.grid.ColumnModel([
      chkColH
  ]);
  
  
          xtype:'editorgrid',
          id:'theGrid',
          stripeRows:true,
          store:gridStore,
          colModel:colModel,
          trackMouseOver:false,
          columnLines:true,
          enableColumnMove:false,
          enableHdMenu:false,
          frame:true,
          disableSelection:true,
          plugins: [chkColH],
          sm:chkSM
  </code></pre>