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.

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