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dhtmlx grid mastercheckbox

Hi,
I am trying use the master check box in dhtmlx grid. But it is not getting.Which js is needed for this. can you please help me

This is the code

mygrid.setHeader("Sales,Book Title,Author,Price,In Store,Shipping,Bestseller,Date of Publication");
mygrid.attachHeader("1,2,3,#numeric_filter,#master_checkbox,6,stat,8");


Thanks

You should include codebase/ext/dhtmlxgrid_filter.js.