title: Extjs4, Control checkcolumn in grid renderer
body: <pre><code>// Grid Column
  { header: "Defected", xtype: 'checkcolumn', dataIndex: "test", renderer : this.chTest}
  
  // renderer function
  chTest : function(value, metadata, record){
    if(record.get('A') == "Y"){
      return true; //I expected the checkbox be checked, but it show letter 'true'
    }else{
      return false;
    }
  }
  </code></pre>
  
  <p>How can I make the checkcolum be checked or unchecked in rederer function?</p>