I am editing a DateTime field in a WebDataGrid and using the WebDateChooser as the Editor provider.  This is all done statically in my web page and not in my code-behind.  It works fine the after the first time the WebDataGrid is databound.  If the user changes his selection criteria and it is bound a 2nd time,  the Popup calendar no longer shows up and the field is edited as plain text.

<table align="center">
        <tr>
            <td>
                <asp:UpdatePanel ID="upGetConfNums" runat="server">
                    <ContentTemplate>
                     <table align="center">
                            <tr>
                                <td class="label" align="right">Conf. #'s (separated by commas or spaces): </td>
                                <td align="left">
                                    <des:TextBox ID="tbConfList" runat="server" MaxLength="300" Width="750px"
                                        Height="18px" />
                                </td>
                            </tr>
                            <tr>
                             <td align="right">
                                </td>
                             <td align="left">
                                    <des:Button ID="btnGetRecords" runat="server" Text="Get Records"
                                        onclick="btnGetRecords_Click" />
                                </td>
                            </tr>
                        </table>
                    </ContentTemplate>
                    <Triggers>
                        <asp:AsyncPostBackTrigger ControlID="btnGetRecords" EventName="Click" />
                    </Triggers>
                </asp:UpdatePanel>
            </td>
        </tr>
        <tr>
            <td colspan="2" align="center">
                <asp:UpdatePanel ID="upUpdateCallTimes" runat="server" Visible="True">
                    <ContentTemplate>
                        <ig:WebDataGrid ID="wdgCMSVSVNCallDates" runat="server" Height="350px"
                            Width="400px" AutoGenerateColumns="False"
                            DataSourceID="sqldsCMSVSVNCallDates" DataKeyFields="Conf_Num"
                            onrowupdated="wdgCMSVSVNCallDates_RowUpdated"
                            onrowupdating="wdgCMSVSVNCallDates_RowUpdating"  >
                            <Behaviors>
                                <ig:EditingCore>
                                    <Behaviors>
                                        <ig:CellEditing>
                                            <ColumnSettings>
                                                <ig:EditingColumnSetting ColumnKey="CallTime"
                                                    EditorID="WebDateChooserProvider1" />
                                                <ig:EditingColumnSetting ColumnKey="Conf_Num" ReadOnly="True" />
                                                <ig:EditingColumnSetting ColumnKey="Category" ReadOnly="True" />
                                            </ColumnSettings>
                                            <CellEditingClientEvents ExitedEditMode="cellEdited" />
                                        </ig:CellEditing>
                                    </Behaviors>
                                </ig:EditingCore>
                                <ig:RowSelectors>
                                </ig:RowSelectors>
                                <ig:Activation>
                                </ig:Activation>
                            </Behaviors>
                            <Columns>
                                <ig:BoundDataField DataFieldName="Conf_Num" Key="Conf_Num">
                                    <Header Text="Conf_Num" />
                                </ig:BoundDataField>
                                <ig:BoundDataField DataFieldName="CallTime" Key="CallTime">
                                    <Header Text="CallTime" />
                                </ig:BoundDataField>
                                <ig:BoundDataField DataFieldName="Category" Key="Category">
                                    <Header Text="Category" />
                                </ig:BoundDataField>
                            </Columns>
                            <EditorProviders>
                                <ig:WebDateChooserProvider ID="WebDateChooserProvider1" />
                            </EditorProviders>
                        </ig:WebDataGrid>
                        <asp:SqlDataSource ID="sqldsCMSVSVNCallDates" runat="server"
                            ConnectionString="<%$ ConnectionStrings:Springwise %>"
                            SelectCommand="GetCMSVSVNCallDatesByConfNumArray"
                            UpdateCommand="UpdateVSVNWorkCallTime"
                            SelectCommandType="StoredProcedure" UpdateCommandType="StoredProcedure">
                            <SelectParameters>
                                <asp:Parameter Name="ConfNums" Type="String" DefaultValue="<ArrayOfString><string Conf_Num='~!@#$' /></ArrayOfString>" />
                            </SelectParameters>
                            <UpdateParameters>
                                <asp:Parameter Name="Conf_Num" Type="String" />
                                <asp:Parameter Name="CallTime" Type="DateTime" />
                            </UpdateParameters>
                        </asp:SqlDataSource>
                    </ContentTemplate>
                    <Triggers>
                        <asp:AsyncPostBackTrigger ControlID="btnGetRecords" EventName="Click" />
                    </Triggers>
                </asp:UpdatePanel>
            </td>
        </tr>
    </table>