Custom group format

There is an opportunity to define the group format

THIS PAGE CONTAINS SAMPLE FUNCTIONALITY OF PROFESSIONAL EDITION FOR DEMONSTRATION PURPOSE ONLY.
UNAUTHORIZED USE IS PROHIBITED. PLEASE CONTACT SALES@DHTMLX.COM TO OBTAIN A LEGAL COPY OF PROFESSIONAL EDITION.

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>    
<script  src="../../codebase/ext/dhtmlxgrid_group.js"></script>    
 
 
<div id="gridbox" style="width:600px;height:250px;background-color:white;"></div>
<script>mygrid = new dhtmlXGridObject('gridbox');
mygrid.setImagePath("../../codebase/imgs/");
mygrid.setHeader("Sales,Book Title,Author,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.setColSorting("na,str,str,int,int,int,na,na");
mygrid.customGroupFormat = function(text, count) {
    return "Grouped by " + text + ", there are " + count + " related records";
};
mygrid.init();
mygrid.setSkin("dhx_skyblue");
mygrid.loadXML("../common/grid.xml", function() {
    mygrid.groupBy(2);
});</script>