I'm trying to test out the Ajax multihandleslider control but the control dos not show up on the screen. Only an empty text box. Am i doing something wrong? This is everything...

<body>
    <form id="form1" runat="server">
    <div>
    
    
    <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true" EnablePartialRendering="true" /> 
    <div>
    <asp:UpdatePanel ID="UpdatePanel2" runat="server">
<ContentTemplate>
<table>
    <tr><td colspan="2">
       <asp:TextBox ID="txtSlider" runat="server"></asp:TextBox>  
    
    <multihandlesliderextender id="MultiHandleSliderExtender1" runat="server" showhandledragstyle="true"
    behaviorid="mhSlider" targetcontrolid="txtSlider" length="500" showinnerrail="true"
        enablemousewheel="false" increment="1" 
        raisechangeonlyonmouseup="true" enablerailclick="false"
       onclientdragend="DragEnd" onclientdrag="Drag" 
        showhandlehoverstyle="true" maximum="222" minimum="1">
        <multihandleslidertargets>
            <multihandleslidertarget controlid="rangeStart" />
            <multihandleslidertarget controlid="rangeEnd" />
        </multihandleslidertargets>  
   </multihandlesliderextender>
   <br />
   </td></tr>
   <tr>
   <td><asp:Label ID="lblStartRange" runat="server" Text=""></asp:Label></td>
   <td><asp:Label ID="lblEndRange" runat="server" Text=""></asp:Label> </td>
   </tr>  
    <tr><td>
    <asp:HiddenField ID="rangeEnd" Value="10" runat="server" />
    <asp:HiddenField ID="rangeStart" Value="1" runat="server" />
     <asp:HiddenField ID="hdfTrackRangeStart" runat="server" Value="0" />
 <asp:HiddenField ID="hdfTrackRangeEnd" runat="server" Value="0" />
    </td></tr>
</table>
</ContentTemplate>            
</asp:UpdatePanel>
</div>


    </div>
    </form>
</body>

Visual Studio 2008 is just full off bugs. I re-coded everything and in design view it still says there is an error but when you run the page it works 100%.

<asp:MultiHandleSliderExtender ID="MultiHandleSliderExtender2" runat="server" ShowHandleDragStyle="true"
        BehaviorID="mhSmider" TargetControlID="txtSlider" Length="500" ShowInnerRail="true"
        EnableMouseWheel="false" Increment="1" RaiseChangeOnlyOnMouseUp="true" EnableRailClick="true"
        Maximum="222" Minimum="1">
            <MultiHandleSliderTargets>
                <asp:MultiHandleSliderTarget ControlID="rangeStart" />
                <asp:MultiHandleSliderTarget ControlID="rangeEnd" />
            </MultiHandleSliderTargets>
        </asp:MultiHandleSliderExtender>
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