protected void MaterialsGrid_NeedDataSource(object source, GridNeedDataSourceEventArgs e)
{
    MaterialsGrid.DataSource = orderService.GetSalesOrderItemsBySector(SessionService.CurrentSectors);
}

< telerik:RadGrid ID="RadGrid1" runat="server" AllowFilteringByColumn="True" AutoGenerateColumns="False" GridLines="None" AllowMultiRowSelection="True">
    < MasterTableView>
        < CommandItemSettings ExportToPdfText="Export to Pdf">< /CommandItemSettings>

        < RowIndicatorColumn>
        < HeaderStyle Width="20px">< /HeaderStyle>
        < /RowIndicatorColumn>

        < ExpandCollapseColumn>
            < HeaderStyle Width="20px">< /HeaderStyle>
        < /ExpandCollapseColumn>
        < Columns>
            < telerik:GridBoundColumn AutoPostBackOnFilter="True" DataField="ProductName" HeaderText="Product Name" UniqueName="ProductName">
            < /telerik:GridBoundColumn>
            < telerik:GridBoundColumn DataField="Cost" HeaderText="Cost" UniqueName="Cost" AutoPostBackOnFilter="True">
            < /telerik:GridBoundColumn>
        < /Columns>
    < /MasterTableView>
< /telerik:RadGrid>

Private Sub RadGrid1_ItemCommand(ByVal source As Object, ByVal e As Telerik.Web.UI.GridCommandEventArgs) Handles RadGrid1.ItemCommand

        If e.CommandName = "Filter" Then

            'Bind grid when filtering.
            RadGrid1.Rebind()

        End If
    End Sub