I hav a button inside the ajax popupextender.when we click the button , the button is not firing

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Ajax

C#3.5

I hav a button inside the Ajax popupextender.When We click the Button ,the button is not firing. Here is my Code

  <ajax:ToolkitScriptManager ID="ajaxTool" runat="server">
</ajax:ToolkitScriptManager>
   <ajax:ModalPopupExtender ID="popupForPwd" runat="server" PopupControlID="pnlforPwd" BehaviorID="brnSubmitEmail" Enabled="true" DropShadow="true" TargetControlID="lnkForgot" PopupDragHandleControlID="popupheader" BackgroundCssClass="popup" CancelControlID="btnCanel"></ajax:ModalPopupExtender>
   <asp:Panel ID="pnlforPwd" runat="server" align="center" BackColor="Blue" Width="500px" Height="500px" CssClass="pnlpopo">
   <table>
   <asp:Label ID="lblEmail" runat="server" Text="Email"></asp:Label>
   <asp:TextBox ID="txtEmail" runat="server"></asp:TextBox>
   </table>
   <asp:Button ID="brnSubmitEmail" runat="server" Text="Submit" onclick="brnSubmitEmail_Click" />
 <asp:Button ID="btnCanel" runat="server" Text="Cancel" />
 <asp:Label ID="lblmail" runat="server"></asp:Label>
   </asp:Panel>

What I have tried:

I tried the above code .But the button is Not firing.