Problem with PasswordStrength extender

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ASP.NET

I want to add PasswordStrength extender on my password text box which is on a modelpupup. Password strength is not displaying on the popup but displaying on the form. It should be display on the popup above the password text box.

Code is as fallows;

<cc1:ModalPopupExtender ID="mpeSignUpDiv" BehaviorID="mpeSignUpDiv" BackgroundCssClass="modalBackground" PopupControlID="divSignUp"
          runat="server"   TargetControlID="lbSignUp"  
            X="250" Y="70">
        </cc1:ModalPopupExtender>
        
    <div id="divSignUp" class="poplogDiv" style="display:block; ">
      <h1>  Email:</h1>
        <asp:TextBox ID="txtEmail" runat="server" CssClass ="popcontexBox"></asp:TextBox>
        <br />
        <h1>Password:</h1>
         <asp:TextBox ID="txtPassSU" runat="server" TextMode="Password" CssClass ="popcontexBox"></asp:TextBox>
        <cc1:PasswordStrength ID="txtPassSU_PasswordStrength"  runat="server"
            Enabled="True" TargetControlID="txtPassSU" DisplayPosition="AboveRight" PreferredPasswordLength="6" >
        </cc1:PasswordStrength>

         <br />
            <h1>Confirm:</h1>
         <asp:TextBox ID="txtConfirm" runat="server" TextMode="Password" CssClass ="popcontexBox"></asp:TextBox>
            <asp:Button ID="btnSignUp" runat="server" Text="Signup" CssClass ="logDivBtn" style="float:left;margin-top:10px" OnClientClick="ShowPopupForSignUp(); return false;" />
            <asp:Button ID="btnClose" CssClass ="logDivBtn" runat="server" Text="Close" style="float:right;margin-top:10px" OnClientClick="$find('mpeSignUpDiv').hide(); return false;" />
            </div>
    
    
               <cc1:ModalPopupExtender ID="mpeSignUp" BehaviorID="mpeSignUp" BackgroundCssClass="modalBackground" PopupControlID="pnlSignUp"
          runat="server"   TargetControlID="btnAllocate_Target"  
            X="500" Y="250">
        </cc1:ModalPopupExtender>

Atiq