Thank you for prompt reply.
Adding 'cls' property to the editable column on server side helped to highlight the columns. But the column header has also been highlighted, which looks weird. Looking deeply, noticed in the example you provided has the column header with '<th>' tags but the columns in the grid I used as <td> tags in the header row. I am not sure, why <td> tags are rendered in the header row instead of <th>, do you know why?
Thanks.