<asp:DataList ID="DataList1" runat="server" RepeatColumns="1" RepeatDirection="Horizontal"
                    Style="width: 680px;" DataSourceID="DS_Detail">
                    <ItemTemplate>
...
                                    <ext:Button runat="server" Text="View">
                                        <AjaxEvents>
                                            <Click OnEvent="View_Click">
                                                <EventMask ShowMask="true" Msg="Wait...." />
                                                <ExtraParams>
                                                    <ext:Parameter Name="ID" Value='<%# Eval("ID") %>' />
                                                </ExtraParams>
                                            </Click>
                                        </AjaxEvents>
                                    </ext:Button>
...

                    </ItemTemplate>
                </asp:DataList>
The value of "Parameter" bind failed