Grid Refresh Error.

Hi,
I am dynamically adding new row in the grid. I add row to XML datasource, update the row count property of grid object. New row is successfully added to the grid.

Now for refreshing the grid, I call request method of Active.XML.Table object and then call refresh method of the grid.
I get error in refresh function of grid.
obj.refresh=function(){try{var element=this.element();if(element){element.outerHTML=this.toString()}}catch(error){this.handle(error)}}
The bold part of the code in refresh function gives me the error. Error message is "null is null or not an object". This is for "toString()"

My Code is

<script>
var table = new Active.XML.Table;
   table.setURL("companies-simple.xml");
   table.request();   
 var obj = new Active.Controls.Grid;
 obj.setModel("data", table);
    document.write(obj);
<script>

function AddRow()
{

    var dataXmlDoc = obj.getDataProperty('XML');
    var rootNode = dataXmlDoc.documentElement;
    var newRow = dataXmlDoc.createElement( "company" );
   
   
   var colName = dataXmlDoc.createElement( "ticker" ); 
   newRow.appendChild(colName);
   
   var colName = dataXmlDoc.createElement( "name" ); 
   newRow.appendChild(colName);
   
   var colName = dataXmlDoc.createElement( "mktcap" ); 
   newRow.appendChild(colName);
   
   var colName = dataXmlDoc.createElement( "sales" ); 
   newRow.appendChild(colName);
   
   var colName = dataXmlDoc.createElement( "employees" ); 
   newRow.appendChild(colName);
    
    rootNode.appendChild(newRow);
    obj.setRowProperty("count", rootNode.childNodes.length);  
    obj.refresh(); 
}

Can any one please help me? Thanks in advance.

Solved using http://www.activewidgets.com/javascript.forum.1788.29/bug-caused-by-sorting.html