javascript __dopostback ('MaGridview' 'select$0')

Bonjour à tous,
J'ai une application en .net qui fonctionne bien. Mon rôle est d'ajouter un popup "image.gif + Patientez SVP..Chargment en cours". Pour ce faire j'ai utilisé UpdatePanel+UpdateProgress:
Mon popup s'affiche bien mais le problème le liens dans ma GridView ne fonctionne plus. Quand je click il m'affiche en bas de la page :
Citation:
:
J'ai ajouté des trigger à ma grid mais toujours le même problème.

Voici mon code :
Code:
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   <asp:Panel ID="panResultat" runat="server" Height="236px" Style="z-index: 128; left: 5px;
                        position: absolute; top: 370px; background-color: #afafff" Width="940px" 
                            Visible="false">
                    <asp:Label ID="lblTitre2" runat="server" Style="z-index: 100; left: 532px; position: absolute;
                        top: 5px; height: 26px; width: 400px;" 
                            Text="Résultat de la Recherche (liste de candidatures):"></asp:Label>
 
 
                    <asp:SqlDataSource ID="sdsListeCandidatures" runat="server" 
                        ConnectionString="<%$ ConnectionStrings:IDIRH_TESTConnectionString %>"
                        ProviderName="<%$ ConnectionStrings:IDIRH_TESTConnectionString.ProviderName %>"
                        SelectCommand="SELECT can_id, nom, prenom, convert(varchar(10),date_creation,103) as date_creation_formatee FROM dbo.candidature " 
                        EnableCaching="false" DataSourceMode="DataSet"
                        >                        
                    </asp:SqlDataSource>
                    <asp:GridView ID="gvListeCandidatures" runat="server"  
                        AutoGenerateColumns="False" BackColor="LightGoldenrodYellow"
                        BorderColor="Tan" CellPadding="2" 
                        DataSourceID="sdsListeCandidatures" ForeColor="Black" 
                        Style="z-index: 103; left: 5px; position: absolute;
                            top: 5px; width: 350px; height: 144px;" AllowPaging="True" Font-Names="Arial" 
                        PageSize="7" DataKeyNames="CAN_ID">
                        <FooterStyle BackColor="Teal" BorderColor="GrayText" />
                        <Columns>
                            <asp:CommandField ShowSelectButton="True" SelectText="Voir">
                                <ItemStyle Width="40px" Height="20px" Wrap="False" />
                                <ControlStyle Width="40px" />
                                <HeaderStyle Height="25px" Wrap="False" />
                                <FooterStyle Height="25px" Wrap="False" />
                            </asp:CommandField>
                            <asp:BoundField DataField="NOM" HeaderText="NOM" SortExpression="NOM">
                                <ItemStyle Width="80px" Wrap="False" Height="20px" />
                                <ControlStyle Width="80px" />
                                <HeaderStyle Height="25px" Wrap="False" />
                                <FooterStyle Wrap="False" />
                            </asp:BoundField>
                            <asp:BoundField DataField="PRENOM" HeaderText="PRENOM" SortExpression="PRENOM">
                                <ItemStyle Width="160px" Wrap="False" Height="20px" />
                                <ControlStyle Width="160px" />
                                <HeaderStyle Height="25px" Wrap="False" />
                                <FooterStyle Wrap="False" />
                            </asp:BoundField>
                            <asp:BoundField DataField="CAN_ID" HeaderText="ID" InsertVisible="False" ReadOnly="True"
                                SortExpression="CAN_ID" ShowHeader="False" Visible="False">
                                <ItemStyle Width="1px" />
                                <ControlStyle Width="1px" />
                                <HeaderStyle Width="1px" Height="25px" />
                                <FooterStyle Width="1px" />
                            </asp:BoundField>
                            <asp:BoundField DataField="date_creation_formatee" HeaderText="Créé le" 
                                SortExpression="date_creation_formatee" >
                            <ControlStyle Width="70px" />
                            <HeaderStyle Height="25px" />
                            <ItemStyle Width="70px" Wrap="False" Height="20px" />
                            </asp:BoundField>
                        </Columns>
                        <SelectedRowStyle BackColor="DarkSlateBlue" ForeColor="GhostWhite" 
                            BorderColor="GrayText" Height="20px" Wrap="False" />
                        <PagerStyle BackColor="#FFEF6F" ForeColor="DarkSlateBlue" 
                            HorizontalAlign="Center" BorderColor="GrayText" BorderStyle="Solid" 
                            BorderWidth="1px" Height="25px" Wrap="False" />
                        <HeaderStyle BackColor="#FFD240" Font-Bold="True" BorderColor="GrayText" 
                            Height="25px" Wrap="False" />
                        <AlternatingRowStyle BackColor="PaleGoldenrod" BorderColor="GrayText" 
                            BorderStyle="Solid" BorderWidth="1px" Height="20px" Wrap="False" />
                        <RowStyle BorderColor="GrayText" BorderStyle="Solid" BorderWidth="1px" 
                            Height="20px" Wrap="False" />
                        <EmptyDataRowStyle BorderColor="GrayText" BorderStyle="None" />
                        <EditRowStyle BorderColor="GrayText" />
                    </asp:GridView>
 
                <asp:Button ID="btnPortail" runat="server" Style="z-index: 134; left: 845px; position: absolute;
                    top: 515px; background-color: #8080ff;" Text="IDIPortail" Width="85px" />
                <asp:Button ID="btnback" runat="server" OnClientClick="return back();" 
                    Style="z-index: 134; left: 745px; position: absolute; top: 550px; background-color: #8080ff" 
                    Text="Back" Width="85px" />
                <asp:Button ID="Btnnext" runat="server" OnClientClick="return next();" 
                    Style="z-index: 134; left: 845px; position: absolute; top: 550px; background-color: #8080ff" 
                    Text="Next" Width="85px" />
                </asp:Panel>
 
 
 </td>
 
                </tr>
                </table>
                   </ContentTemplate>
                   <Triggers> 
                   <asp:AsyncPostBackTrigger ControlID="btnRechercher" EventName="Click" />   
                   <asp:AsyncPostBackTrigger ControlID="gvListeCandidatures" EventName="SelectedIndexChanged" />
 
 
 
                    </Triggers>
 
                </asp:UpdatePanel>
Est ce que vous pouvez m'aider SVP ?
Merci d'avance pour votre retour .