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我给出了使用 AJAX 的模态弹出窗口的编码。问题是当我单击按钮时，弹出窗口没有显示，它只是闪烁一次。查看我的代码并告诉我它有什么问题。

<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
   <asp:LinkButton ID="LinkButton1" runat="server">Login</asp:LinkButton>
   <asp:Panel ID="Panel1" runat="server" Width="241px" Style="display:none" >
    <table style="border-style: inherit; border-width: thin; width:100%;">
        <tr>
             <td class="style2">Username</td>
             <td><asp:TextBox ID="TextBox1" runat="server"></asp:TextBox></td>
        </tr>
        <tr>
            <td class="style3">Password</td>
            <td class="style1"><asp:TextBox ID="TextBox2" runat="server"></asp:TextBox></td>
        </tr>
        <tr>
            <td class="style2"><asp:Button ID="Button1" runat="server" Text="Signin" />               </td>
            <td><asp:Button ID="Button2" runat="server" Text="Cancel" /></td>
        </tr>
    </table>
</asp:Panel>
<ajaxTK:ModalPopupExtender ID="ModalPopupExtender" runat="server" 
                           TargetControlID="LinkButton1"
                           PopupControlID="Panel1" 
                           OkControlID="Button1" 
                           CancelControlID="Button1"
                           BackgroundCssClass="modepop">
</ajaxTK:ModalPopupExtender>
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