Ajax模式弹出扩展器BackgroundCssClass不起作用

问题描述

您好，程序员，这里有个小问题.

Hello programmers, got a small problem here. The

<cc1:PopupControlExtender ID="Popup" runat="server" TargetControlID="Button1" PopupControlID="popUpPanel" BackgroundCssClass="" >
</cc1:PopupControlExtender>

无法正常工作，类型"AjaxContolToolkit.PopupcontrolExtender"没有公共属性名称"BackgroundCssClass"
那是什么意思?

谢谢，还有更多力量

is not working saying type ''AjaxContolToolkit.PopupcontrolExtender'' does not have a public property name ''BackgroundCssClass''
Whats the meaning of that?

Thanks and more power

<%@ Page Title="" Language="VB" MasterPageFile="~/MasterPage.master" AutoEventWireup="false" CodeFile="Default2.aspx.vb" Inherits="Default2" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

<asp:Button ID="Button1" runat="server" Text="Button" />

    <cc1:ToolkitScriptManager ID="ToolkitScriptManager1"  runat="server">

<br />
<cc1:PopupControlExtender ID="Popup"  runat="server" TargetControlID="Button1" PopupControlID="popUpPanel" BackgroundCssClass="" >

<asp:Panel ID="popUpPanel" runat="server"
      CssClass="modalPopup"  Style="display: none;"   >
<div>
<h2>
Thanks For Visiting This Site</h2>
<div>
<asp:Button ID="btnOk" runat="server" Text="Ok"/>
</div></div>


    <cc1:DropShadowExtender ID="popUpPanel_DropShadowExtender"  runat="server"
        Enabled="True" TargetControlID="popUpPanel">

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