The RadGrid control itself does not have a client-side function that rebinds the grid on the server. As noted in my previous reply, you need to use the RadAjax's client-side API to initiate Ajax request that would rebind your grid on the server. For example you can check the followin demo which shows the same approach but with the ASP.NET versions of our controls:
Since you are using the Prometheus versions however, you need to change the client code accordingly to the Client-Side API of the Prometheus RadAjax
where arguments are the parameters, which the control had used when it raised the request .
the Telerik team