Expand Infragistics Grid using javascript

 Call the expandGrid function in onclientclick event of button.
  
    function expandGrid()
    {          
        var grid = igtbl_getGridById('<%=UltraWebGrid1.ClientID%>');      
        expand(grid);
    }

    function expand(grid)
    {           
      var rowsLength = grid.Rows.length;
        for (var i = 0; i < rowsLength; i++)
        {
            var rowObj = grid.Rows.getRow(i);
     
            if(rowObj.ChildRowsCount != 0)
            {           
                rowObj.setExpanded(true);
                expand(rowObj);
            }
            else
            {
                break;
            }
        }     
    }