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Hi,

In case of the main header and sub-header. How to hide the main header, on hiding the main header it should also close the sub-header.

There is no possibility to dynamically show\hide grid's header. You can create grid without header with setNoHeader() method. http://dhtmlx.com/dhxdocs/doku.php?id=dhtmlxgrid:api_method_dhtmlxgridobject_setnoheader
Also you can detach attached header with detachHeader() method
http://dhtmlx.com/dhxdocs/doku.php?id=dhtmlxgrid:api_method_dhtmlxgridobject_detachheader