comment utliser 3 dropdowlists reliees dans un update panel

Salut,

Je m explique,
dans un formulaire j ai trois drowndownlists, la valeur selectionnee dans la premiere liste va determiner le contenu de la seconde liste, de meme qu une valeur selectionne dans la seconde liste va deteminer le contenu de la liste 3

pour eviter d avoir une page rafraichie a chaque fois que je touche a l un des 2 premieres listes, j ai donc place mes 3 dropdownlists dans un updaepanel
. Cependant ca ne change rien, la page est toujours rafraichie de la meme maniere.

Pouvez m aider a decouvir pourquoi ?
Voici mon code :

Code:

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<form id="form2" runat="server">
 
 
 
    <asp:PlaceHolder id="PlaceHolder1" runat="server"></asp:PlaceHolder>
     <asp:ScriptManager ID="ScriptManager1" runat="server" />
 
 
    <table id="table1">
    <asp:UpdatePanel ID="updatePnl" runat="server" UpdateMode="Always">
            <ContentTemplate>
 
				<tr>
					<td style="HEIGHT: 18px">
						<p><asp:label id="Label15" runat="server" Font-Bold="true" Font-Size="Smaller" Font-Names="Tahoma"
								Width="128px">Game Title:</asp:label></p>
					</td>
					<td style="WIDTH: 364px; HEIGHT: 18px">
						<p><asp:dropdownlist id="ddlTitle" runat="server" Width="320px" autopostBack="true"></asp:dropdownlist><asp:requiredfieldvalidator id="valReqTitle" runat="server" ToolTip="Title is required" ControlToValidate="ddlTitle"
								Display="Dynamic" EnableClientScript="False" InitialValue="please Select....." Height="8px">
								<img src="../images/ValError.gif" alt="coucou" /></asp:requiredfieldvalidator></p>
					</td>
					<td style="HEIGHT: 18px">
						<p><span class="ms-formdescription"><span class="ms-formdescription" style="FONT-SIZE: smaller; FONT-FaMILY: Tahoma">Select 
									a Game.&nbsp; Use 'other' for non game related requests.</span></span></p>
					</td>
				</tr>
				<tr>
					<td><asp:label id="Label14" runat="server" Font-Bold="true" Font-Size="Smaller" Font-Names="Tahoma"
							Width="128px">platform:</asp:label></td>
					<td style="WIDTH: 364px">
						<p><asp:dropdownlist id="ddlFullPlatform" runat="server" Width="320px" autopostBack="true"></asp:dropdownlist><asp:requiredfieldvalidator id="ValReqplatform" runat="server" ToolTip="platform is required" ControlToValidate="ddlFullplatform"
								Display="Dynamic" EnableClientScript="False" InitialValue="please Select....." Height="8px">
								<img src="../images/ValError.gif" alt="coucou" /></asp:requiredfieldvalidator></p>
					</td>
					<td><span class="ms-formdescription" style="FONT-SIZE: smaller; FONT-FaMILY: Tahoma"></span></td>
				</tr>
 
				<tr>
					<td><asp:label id="Label16" runat="server" Font-Bold="true" Font-Size="Smaller" Font-Names="Tahoma"
							Width="128px">Version:</asp:label></td>
					<td style="WIDTH: 364px"><asp:dropdownlist id="ddlVersion" runat="server" Width="320px" ></asp:dropdownlist><asp:requiredfieldvalidator id="valReqVersion" runat="server" ToolTip="Version is required" ControlToValidate="ddlVersion"
							Display="Dynamic" EnableClientScript="False" InitialValue="please Select....." Height="8px">
							<img src="../images/ValError.gif" alt="coucou" /></asp:requiredfieldvalidator></td>
					<td><span class="ms-formdescription" style="FONT-SIZE: smaller; FONT-FaMILY: Tahoma">Code 
							version. Check <a href="http://intranet/departments/qa/UKQa/mastering/Lists/VC/Latest%20Code.aspx"
								target="Version Control">Version Control</a> list.&nbsp; ask producer/qa if 
							necessary - May slow down processing if not filled in accurately.&nbsp;</span></td>
				</tr>
 
 
				 </ContentTemplate>
        </asp:UpdatePanel>
 
 
				<tr>
					<td style="HEIGHT: 37px"><asp:label id="Label13" runat="server" Font-Bold="true" Font-Size="Smaller" Font-Names="Tahoma"
							Width="128px">Department:</asp:label></td>
					<td style="WIDTH: 364px; HEIGHT: 37px">
						<p><asp:dropdownlist id="ddlDepartment" runat="server" Width="320px" ></asp:dropdownlist><asp:requiredfieldvalidator id="valrReqDepartment" runat="server" ToolTip="Department is required" ControlToValidate="ddlDepartment"
								Display="Dynamic" EnableClientScript="False" InitialValue="please Select....." Height="8px"> <img src="../images/ValError.gif" alt="coucou" /></asp:requiredfieldvalidator>
								</p>
					</td>
					<td style="HEIGHT: 37px"><span class="ms-formdescription"><span class="ms-formdescription"><span class="ms-formdescription" style="FONT-SIZE: smaller; FONT-FaMILY: Tahoma">If 
									for preview/Review please forward list of names to <a href="mailto:Mastering@eidos.co.uk">
										Mastering@eidos.co.uk</a></span></span></span></td>
				</tr>
 
			</table>		
 
    </form>

Voici le contenu de mon config file

Code:

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<?xml version="1.0"?>
<configuration>
 
	<connectionStrings/>
	<system.web>
 
		<compilation debug="true">
			<assemblies>
				<add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
				<add assembly="System.Data.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
				<add assembly="System.Data.Services, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
				<add assembly="System.Data.Services.Client, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
				<add assembly="System.DirectoryServices, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
				<add assembly="System.Net, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
				<add assembly="System.Security, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
				<add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
				<add assembly="SourceCode.HostClientAPI, Version=4.0.0.0, Culture=neutral, PublicKeyToken=16A2C5AAAA1B130D"/>
				<add assembly="SourceCode.Workflow.Client, Version=4.0.0.0, Culture=neutral, PublicKeyToken=16A2C5AAAA1B130D"/>
				<add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/></assemblies></compilation>
 
		<authentication mode="Windows"/>
 
    <pages>
      <controls>
        <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
      </controls>
    </pages>
	</system.web>
</configuration>

Merci d avance pour votre aide.
Arioule