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我在网页上工作，在那里我有一些字段，并通过那希望生成气球弹出悬停。生成是越来越成功，但气球弹出不可见在运行时请帮帮我。 Balloon Popup Extender在运行时不可见
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager2" runat="server">
</asp:ScriptManager>
<table><tr><td>First Name:</td><td><asp:TextBox ID="txtfirst" runat="server"></asp:TextBox></td></tr>
<tr><td>Middle Name:</td><td><asp:TextBox ID="txtmiddlename" runat="server"></asp:TextBox></td></tr>
<tr><td>Last Name:</td><td><asp:TextBox ID="txtlast" runat="server"></asp:TextBox></td></tr>
</table>
<cc1:BalloonPopupExtender ID="BalloonPopupExtender1" runat="server" TargetControlID="txtfirst" BalloonPopupControlID="pan1" BalloonSize="Medium" BalloonStyle="Rectangle" DisplayOnMouseOver="true" UseShadow="true">
</cc1:BalloonPopupExtender>
<cc1:BalloonPopupExtender ID="BalloonPopupExtender2" runat="server" TargetControlID="txtmiddlename" BalloonPopupControlID="pan2" BalloonSize="Small" BalloonStyle="Cloud" DisplayOnMouseOver="true" >
</cc1:BalloonPopupExtender>
<cc1:BalloonPopupExtender ID="BalloonPopupExtender3" runat="server" TargetControlID="txtlast" BalloonPopupControlID="pan3" UseShadow="true" DisplayOnFocus="true" CustomClassName="oval" CustomCssUrl="~/CSS/Custom.css">
</cc1:BalloonPopupExtender>
<asp:Panel ID="pan1" runat="server">
Enter your First Name
</asp:Panel>
<asp:Panel ID="pan2" runat="server">
Enter your Middle Name
</asp:Panel>
<asp:Panel ID="pan3" runat="server">
Enter your Last Name
</asp:Panel>
</div>
</form>
</body>
</html>
我们需要看到一些代码/错误消息才能够帮助您。 – 2014-09-23 10:18:34
我已经连接了ajax dll ...也是<%--%>文本 – 2014-09-23 10:27:29
有没有我的code.please中的任何错误让我知道在此先感谢 – 2014-09-23 10:31:11