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Problem for Grid Column Type set to dhtmlXCalendar

I am setting Grid column to dhtmlxCalendar but it gives error in dhtmlxgrid.js file as follows

aeditor.setValue(val).

Also please give me necessary requirements for setting grid column type as dhtmlxCalendar.

Thanks & Regards,
BAPU

Most probably you have missed extension file
Please be sure that you have included next two files
        dhtmlxcalendar.js
        dhtmlxgrid_excell_dhxcalendar.js

Including those two files and setting column type as dhxCalendar must be enough