Columns' hiding using header menu

Try to right click on any header. And you will see the menu where columns can be hidden by checking checkboxes.

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/ext/dhtmlxgrid_hmenu.js"></script>
<script  src="../../codebase/dhtmlxgridcell.js"></script>    
 
<style>
   .dhx_header_cmenu{
        background-color:#ffffff;
        border:2px outset silver;
        z-index:2;
    }
.dhx_header_cmenu_item{
    white-space:nowrap;
}        
</style>
 
<table width="600px">
    <tr>
        <td>
            <div id="gridbox" style="width:100%;height:270px;background-color:white;"></div>
        </td>
    </tr>
</table>
 
<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.init();
mygrid.setSkin("dhx_skyblue");
mygrid.enableHeaderMenu();
mygrid.setColumnHidden(2, true);
mygrid.loadXML("../common/grid_16_rows_columns_manipulations.xml");</script>