AjaxControlToolkit TabContainer invisible

Bonjour a tous,
j'utilise un Tabcontainer contenant des TabsPanel dans une web user control.

Code:

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<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="ControlWithAjaxTab.ascx.cs" Inherits="WSPUserControlDansPage.ControlWithAjaxTab,WSPUserControlDansPage,Version=1.0.0.0,Culture=Neutral,PublicKeyToken=991adfe14b97d70d"%>
<%@ Register assembly="AjaxControlToolkit, Version=1.0.10618.0, Culture=neutral, PublicKeyToken=28f01b0e84b6d53e" namespace="AjaxControlToolkit" tagprefix="cc1"%>
<cc1:TabContainer ID="TabContainer1" runat="server" ActiveTabIndex="0" Visible="true" Enabled="true"
    Width="726px">
    <cc1:TabPanel runat="server" HeaderText="TabPanel1" ID="TabPanel1"></cc1:TabPanel>
	<cc1:TabPanel ID="TabPanel2" runat="server" HeaderText="TabPanel2"></cc1:TabPanel>
    <cc1:TabPanel ID="TabPanel3" runat="server" HeaderText="TabPanel3"></cc1:TabPanel>
	<cc1:TabPanel ID="TabPanel4" runat="server" HeaderText="TabPanel4"></cc1:TabPanel>
    <cc1:TabPanel ID="TabPanel5" runat="server" HeaderText="TabPanel5"></cc1:TabPanel>
    <cc1:TabPanel ID="TabPanel6" runat="server" HeaderText="TabPanel6"></cc1:TabPanel>
</cc1:TabContainer>

Que je referencie dans une page .aspx

Code:

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<%@ Register assembly="AjaxControlToolkit, Version=1.0.10618.0, Culture=neutral, PublicKeyToken=28f01b0e84b6d53e" namespace="AjaxControlToolkit" tagprefix="cc1"%>
<%@ Register TagPrefix="Test" TagName="TestControl" Src="~/_controltemplates/Test/ControlWithAjaxTab.ascx" %>
<asp:Content ContentPlaceHolderId="PlaceHolderMain" runat="server">
<asp:ScriptManager ID="scriptmanager" runat="server">
</asp:ScriptManager>
<Test:TestControl ID="usercontrol" runat="server">
</Test:TestControl>
</asp:Content>

Mais sur ma page je ne vois rien !!!
quand je regarde mon code html genéré je vois que le tabcontainer est visibility:hidden

Code:

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<div id="ctl00_PlaceHolderMain_usercontrol_TabContainer1" class="ajax__tab_xp" style="width:726px;visibility:hidden;">
	<div id="ctl00_PlaceHolderMain_usercontrol_TabContainer1_header">
		<span id="__tab_ctl00_PlaceHolderMain_usercontrol_TabContainer1_TabPanel1">TabPanel1</span><span id="__tab_ctl00_PlaceHolderMain_usercontrol_TabContainer1_TabPanel2">TabPanel2</span><span id="__tab_ctl00_PlaceHolderMain_usercontrol_TabContainer1_TabPanel3">TabPanel3</span><span id="__tab_ctl00_PlaceHolderMain_usercontrol_TabContainer1_TabPanel4">TabPanel4</span><span id="__tab_ctl00_PlaceHolderMain_usercontrol_TabContainer1_TabPanel5">TabPanel5</span><span id="__tab_ctl00_PlaceHolderMain_usercontrol_TabContainer1_TabPanel6">TabPanel6</span>
	</div><div id="ctl00_PlaceHolderMain_usercontrol_TabContainer1_body">
		<div id="ctl00_PlaceHolderMain_usercontrol_TabContainer1_TabPanel1" style="display:none;visibility:hidden;">
 
		</div><div id="ctl00_PlaceHolderMain_usercontrol_TabContainer1_TabPanel2" style="display:none;visibility:hidden;">
 
		</div><div id="ctl00_PlaceHolderMain_usercontrol_TabContainer1_TabPanel3" style="display:none;visibility:hidden;">
 
		</div><div id="ctl00_PlaceHolderMain_usercontrol_TabContainer1_TabPanel4" style="display:none;visibility:hidden;">
 
		</div><div id="ctl00_PlaceHolderMain_usercontrol_TabContainer1_TabPanel5" style="display:none;visibility:hidden;">
 
		</div><div id="ctl00_PlaceHolderMain_usercontrol_TabContainer1_TabPanel6" style="display:none;visibility:hidden;">

Quelqu'un pourrai m'aider svp

Merci beaucoup