Refresh grid from XML

Refresh operation doesn't recreate grid, it just updates data in it, as result the state of grid is fully preserved.
Source
<link rel="STYLESHEET" type="text/css" href="../../codebase/dhtmlxgrid.css">
<link rel="stylesheet" type="text/css" href="../../codebase/skins/dhtmlxgrid_dhx_skyblue.css">
<script  src="../../codebase/dhtmlxcommon.js"></script>
<script  src="../../codebase/dhtmlxgrid.js"></script>    
<script  src="../../codebase/dhtmlxgridcell.js"></script>
<style>
.even{
    background-color:#E6E6FA;
}
.uneven{
    background-color:#F0F8FF;
}
</style>
 
<div id="gridbox" style="width:600px; height:270px; background-color:white;"></div>
<br>
<div><a href="#" onClick="mygrid.clearAll(); mygrid.loadXML('../common/first.xml');">Reload grid - classic way</a></div>
<div><a href="#" onClick="mygrid.loadXML('../common/second.xml');">Reload grid - clear grid from XML</a></div>
<div><a href="#" onClick="mygrid.updateFromXML('../common/third.xml');">Reload grid - refresh data only </a></div>
<br>
<script>mygrid = new dhtmlXGridObject('gridbox');
mygrid.setImagePath("../../codebase/imgs/");
mygrid.setHeader("Sales,edtxt,ed,Price,In Store,Shipping,Bestseller,Date of Publication");
mygrid.setInitWidths("50,150,100,80,80,80,80,200");
mygrid.setColAlign("right,left,left,right,center,left,center,center");
mygrid.setColTypes("dyn,edtxt,ed,price,ch,co,ra,ro");
mygrid.getCombo(5).put(2, 2);
mygrid.setColSorting("int,str,str,int,str,str,str,date");
mygrid.init();
mygrid.setSkin("dhx_skyblue");
mygrid.enableAlterCss("even", "uneven");
mygrid.loadXML("../common/grid.xml");</script>