我的ModalPopupExtender不工作面板显示在页面上它没有被隐藏

问题描述

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<asp:Content ID="Content1" runat="server" ContentPlaceHolderID="HeadContent">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <asp:Button ID="btnaddcountry" runat="server" Text="Add Country" />
    <cc1:ModalPopupExtender ID="ModalPopupExtender3"  runat="server" TargetControlID="btnaddcountry"
        PopupControlID="paneladdcountry" CancelControlID="Button3" BackgroundCssClass="modalBackground">
    </cc1:ModalPopupExtender>
    <asp:Panel runat="server" ID="paneladdcountry" Font-Bold="true">
        <fieldset id="Fieldset4"  runat="server" style="background-color: Gray; width: 220px;
            height: 195px; padding-left: 18px; padding-right: 18px;">
            <div align="center">
                <h1 style="color: Black; font-weight: bold; font-family: Andalus; text-decoration: underline;
                    font-size: x-large;">
                    Enter Country
                </h1>
                <asp:TextBox ID="txtcountry" runat="server" Style="height: 20px; width: 200px;">
                </asp:TextBox>
                <asp:Button ID="btncountry" runat="server" Text="Save" OnClick="btncountry_Click"
                    Style="width: 66px; height: 26px;" />
                <asp:Button ID="Button3" runat="server" Text="close" Style="width: 66px; height: 26px;" />
            </div>
        </fieldset>
    </asp:Panel>
</asp:Content>

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