I have a simple question - how can I add/edit a single row in the grid with data that has been defined outside of the grid. I don't want to rebind in any way since that will cause a costly database query. I've looked at the set_datasource(json) mechanism, but that requires returning all the row data (and thus a re-query) from the Ajax/Page method call. I just want to add/edit a row with known data. With or without Ajax is fine. Is this possible?