Ext.onReady(function(){ 
  
   var myData = [ 
     ['3m Co',71.72,0.02,0.03,'9/1 12:00am'], 
     ['Alcoa Inc',29.01,0.42,1.47,'9/1 12:00am'], 
     ['Altria Group Inc',83.81,0.28,0.34,'9/1 12:00am'], 
     ['American Express Company',52.55,0.01,0.02,'9/1 12:00am'], 
     ['American International Group, Inc.',64.13,0.31,0.49,'9/1 12:00am'], 
     ['AT&T Inc.',31.61,-0.48,-1.54,'9/1 12:00am'], 
     ['Boeing Co.',75.43,0.53,0.71,'9/1 12:00am'], 
     ['Caterpillar Inc.',67.27,0.92,1.39,'9/1 12:00am'], 
     ['Citigroup, Inc.',49.37,0.02,0.04,'9/1 12:00am'], 
     ['E.I. du Pont de Nemours and Company',40.48,0.51,1.28,'9/1 12:00am'], 
     ['Exxon Mobil Corp',68.1,-0.43,-0.64,'9/1 12:00am'], 
     ['General Electric Company',34.14,-0.08,-0.23,'9/1 12:00am'], 
     ['General Motors Corporation',30.27,1.09,3.74,'9/1 12:00am'], 
     ['Hewlett-Packard Co.',36.53,-0.03,-0.08,'9/1 12:00am'], 
     ['Honeywell Intl Inc',38.77,0.05,0.13,'9/1 12:00am'], 
     ['Intel Corporation',19.88,0.31,1.58,'9/1 12:00am'], 
     ['International Business Machines',81.41,0.44,0.54,'9/1 12:00am'], 
     ['Johnson & Johnson',64.72,0.06,0.09,'9/1 12:00am'], 
     ['JP Morgan & Chase & Co',45.73,0.07,0.15,'9/1 12:00am'], 
     ['McDonald\'s Corporation',36.76,0.86,2.40,'9/1 12:00am'], 
     ['Merck & Co., Inc.',40.96,0.41,1.01,'9/1 12:00am'], 
     ['Microsoft Corporation',25.84,0.14,0.54,'9/1 12:00am'], 
     ['Pfizer Inc',27.96,0.4,1.45,'9/1 12:00am'], 
     ['The Coca-Cola Company',45.07,0.26,0.58,'9/1 12:00am'], 
     ['The Home Depot, Inc.',34.64,0.35,1.02,'9/1 12:00am'], 
     ['The Procter & Gamble Company',61.91,0.01,0.02,'9/1 12:00am'], 
     ['United Technologies Corporation',63.26,0.55,0.88,'9/1 12:00am'], 
     ['Verizon Communications',35.57,0.39,1.11,'9/1 12:00am'], 
     ['Wal-Mart Stores, Inc.',45.45,0.73,1.63,'9/1 12:00am'] 
   ]; 
  
   // example of custom renderer function 
   function change(val){ 
     if(val > 0){ 
       return ' <span style="color:green;">' + val + ' </span>'; 
     }else if(val  < 0){ 
       return ' <span style="color:red;">' + val + ' </span>'; 
     } 
     return val; 
   } 
  
   // example of custom renderer function 
   function pctChange(val){ 
     if(val > 0){ 
       return ' <span style="color:green;">' + val + '% </span>'; 
     }else if(val  < 0){ 
       return ' <span style="color:red;">' + val + '% </span>'; 
   &n