[AJAX] updatepanel et calenderExtender

Bonjour,

je suis débutante en ajax,j'ai un probleme quand j'utilise MaskedEditExtender avec updatepanel,et j'ai pas pu le résoudre
voulà mon code:
Code:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
 
 
<%@ Page Language="VB" MasterPageFile="~/MasterPage.master" AutoEventWireup="false" CodeFile="Default3.aspx.vb" Inherits="Default3" title="Untitled Page" %>
 
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
 
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
 
        <table >
 
 
              <tr>
           <td >
          <asp:UpdatePanel ID="panel1" runat="server" > 
          <ContentTemplate>
             <table style="width: 100%">
             <tr>
                                  <td style="width: 239px; height: 22px;" valign="top">
                            <asp:DropDownList ID="ddlsite" runat="server" CssClass="font"
                                OnSelectedIndexChanged="ddlsite_SelectedIndexChanged">
                                <asp:ListItem Selected="True" Value="0">-- Choisissez --</asp:ListItem>
                                <asp:ListItem>CasaShore</asp:ListItem>
                                <asp:ListItem>Technopolis</asp:ListItem>
                                <asp:ListItem>Tous</asp:ListItem>
                            </asp:DropDownList>
                            <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="ddlsite"
                                ErrorMessage="RequiredFieldValidator" InitialValue="0" ValidationGroup="ajouter" 
                                Font-Size="Smaller" Width="136px">Champs requis</asp:RequiredFieldValidator></td>
 
 
                    </tr>
 
                </table>
              </ContentTemplate></asp:UpdatePanel>
           </td>
 
 
                        <td style="width: 176px; height: 22px;" valign="top">
                            <asp:FileUpload   ID="FileUpload1"   runat="server" CssClass="font" BackColor="White" />
                            <asp:LinkButton ID="LinkButton1" runat="server" Visible="False">
                           <div class="font" style="font-weight:bolder;color:darkred;">Ouvrir le devis</div></asp:LinkButton></td>
 
 
                    </tr>
                            <tr>
            <td align="center" style="height: 107px">
 
 
                <cc1:MaskedEditExtender ID="MaskedEditExtender2" runat="server" AcceptNegative="Left"
                    DisplayMoney="Left" ErrorTooltipEnabled="True" InputDirection="RightToLeft" Mask="99/99/9999"
                    MaskType="Date" MessageValidatorTip="true" OnFocusCssClass="MaskedEditFocus"
                    OnInvalidCssClass="MaskedEditError" TargetControlID="txtdateliv" UserDateFormat="DayMonthYear">
                </cc1:MaskedEditExtender>
 
 
 
 
 
 
                    </td>
        </tr>
           </table>
 
 
 
 
 
 
</asp:Content>
quand je veux afficher la page voula le message d'erreur "An extender can't be in a different UpdatePanel than the control it extends".

MERCI