hi

i use ModalPopupExtender from AjaxControlToolkit to show a panel. my panel have something like this:

                                            <asp:Panel ID="pnlSearchPlan" runat="server"  style="background-color:#ffffdd;border-width:3px;border-style:solid;border-color:Gray;padding:3px;width:400px;">
                                        <asp:ScriptManager ID="ScriptManager1" runat="server">
                                        </asp:ScriptManager>                                            
                                            <cc1:ModalPopupExtender ID="UpdatePanel1_ModalPopupExtender" runat="server" 
                                                TargetControlID="linkToPopup"
                                                PopupControlID="pnlSearchPlan"
                                                BackgroundCssClass="ModalBackColor"
                                                DropShadow="true"
                                                OkControlID="tbnSelect"
                                                OnOkScript="onOk()"
                                                CancelControlID="btnCancel">
                                            </cc1:ModalPopupExtender>
                                        <asp:UpdatePanel ID="UpdatePanel1" runat="server"> 
                                        <ContentTemplate>
                                        <table width="100%" dir="rtl">
                                            <tr>
                                                <td >owner</td>
                                                <td>
                                                    <asp:TextBox ID="txtCriteria" runat="server" ></asp:TextBox>
                                                    <asp:Button ID="btnOk" runat="server" Text="ok" onclick="btnOk_Click" />
                                                    <asp:Button ID="tbnSelect" runat="server" Text="select" 
                                                        onclick="tbnSelect_Click" />                                                        
                                                    <asp:Button ID="btnCancel" runat="server" Text="close" />
                                                </td>
                                            </tr>           
                                            <tr>
                                                <td colspan="2">

                                                    </asp:RadioButtonList>                                                    
                                                </td>
                                            </tr>                                     
                                            <tr>
                                                <td colspan="2" align="center">

                                                    <pcal:CustomGridView ID="gdvPlan" runat="server" CellPadding="4" 
                                                        ForeColor="Black" GridLines="Vertical" BackColor="White" 
                                                        BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px">
                                                        <RowStyle BackColor="#F7F7DE" />
                                                        <FooterStyle BackColor="#CCCC99" />
                                                        <PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
                                                        <SelectedRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
                                                        <HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
                                                        <AlternatingRowStyle BackColor="White" />
                                                    </pcal:CustomGridView>

                                                </td>
                                            </tr>
                                        </table>
                                        </ContentTemplate>                                                                                       
                                        </asp:UpdatePanel>

                                        </asp:Panel>

now want return one cell of gridview after ModalPopupExtender is closed,

is this possible without postback? is there any way to return value after close?