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coro type cell is not editable without click of mouse.

When i use tab then not able to write in coro type cell .one click of mouse is required for editing
.i want two write on first instance.

You can try to use excel-like keymap, it allow to start edit by any key pressing
Please check
   
    http://dhtmlx.com/docs/products/dhtmlxGrid/samples/navigation/pro_keymap_excel.html
    http://dhtmlx.com/docs/products/dhtmlxGrid/samples/navigation/pro_keymap_access.html