customRenererForProgressInGrid2.js

renderer: function( value, metaData, record, rowIndex, colIndex, store ){
    var id = Ext.id();
    (function(){
      var progress = Ext.ProgressBar({
        renderTo: id,
        value: progress_value
      });
    }).defer(25);
    return '<div id="' + id +'"></div>';
  }