ModalPopupExtender and Event

[Melina]

Hi,

I just would like to have a Button, with an NnClick event.
Two problems with the code below :
* The OnClick Event "Proc1" is never reached.
* The Panel isn't modal at all, i can still click on the button

<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server"
EnablePartialRendering="true"/>
<asp:Button ID="Button1" runat="server" Text="Upload" OnClick="Proc1"/>
<cc1:ModalPopupExtender runat="server" TargetControlID="Button1"
ID="modalPopupExtenderLoading" PopupControlID="Popup"

></cc1:ModalPopupExtender>

<asp:Panel ID="Popup" runat="server" Style="display:none;">
<div style="margin-left:auto; margin-right:auto; width:50px;">
<img src="loader.gif" alt="Loading..." />
</div>
</asp:Panel>
</form>

Many Thanks !