my modelpopupextender is not visible in ie as well as firefox.It is not showing the popup control in the client side.

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VB

When I am calling the model popup control,it is not visible in the browser ,though all the codings are calling.

My coding is ,

<asp:Panel ID="tstpnl">
   <table>
   <tr>
   <td>
   <asp:Label ID="tstlbl" runat="server" Text="Panel Test"></asp:Label>
   </td>
<td>
  <asp:Button ID = "btnok" runat = "server" Text = "Add" CssClass="btn"  />
<td>
   </tr>
   </table>

   </asp:Panel>

My model popup control is

<ajax:ModalPopupExtender ID="modalPopupExtender_test" BackgroundCssClass = "modalBackground" runat="server" Drag ="true"
PopupControlID="tstpnl"
TargetControlID="Btnclick">
</ajax:ModalPopupExtender>
<asp:Button ID ="Btnclick" runat="server" style="display: none;"></asp:Button>

.modalBackground
{
 background-color: Gray;
    filter: alpha(opacity=70);
    opacity: 0.7;
}

Dim PopupManPower As AjaxControlToolkit.ModalPopupExtender = modalPopupExtender_test

       PopupManPower.Show()

Though I am using allthose codes My poup is not visible in the page.I am having this types of popups in other pages .It is working fine.