help UpdateProgress not working

Hi to all

I have this code, and I don't know what is wrong.

asp:MultiView ID="multiv" runat="server" EnableTheming="true">
<asp:View ID="VImage" runat="server">
<asp:ScriptManagerProxy ID="ScriptManagerProxy1" runat="server" ></asp:ScriptManagerProxy>

<asp:UpdateProgress ID="UpdateProgress1" runat ="server" DynamicLayout ="false" AssociatedUpdatePanelID ="UpdatePanel2">
<ProgressTemplate >
<img alt="Progress" src="~/Images/Newfolder/Loading.GIF" />
</ProgressTemplate>
</asp:UpdateProgress>


<div id="div2" style="height: 778px; overflow-y: auto;">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<!-- <asp:PostBackTrigger ControlID="ImageBtnSave" /> For File upload to get the filename -->
<asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode ="Conditional" >
<Triggers>
<asp:PostBackTrigger ControlID="ImageBtnSave" />
</Triggers>
<ContentTemplate>

<table style="width: 810px">
<tr>
<td colspan="4">


<asp:FileUpload ID="FileUp" runat="server" AllowMultiple ="true"/>
&nbsp;&nbsp;<asp:ImageButton ID="ImageBtnSave" runat="server"
OnClick="ImageBtnSave_Click"
Width="16px" Height="16px" ImageUrl="~/Images/ImageButton/upload.png" ToolTip="Upload"/>
&nbsp;<asp:ImageButton ID="ImageButton2" runat="server" />
&nbsp;<asp:ImageButton ID="ImageButton3" runat="server" />

</td>
</tr>
<tr>

The updateprogress not shown.

Thanks.