母版页下的页面使用CKEditor:CKEditorControl出错，找不到对象。单个页面调用是正常的。

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<%@ Page Title=" " Language="C#" MasterPageFile="~/PublicHead2.master" AutoEventWireup="true" CodeFile="postTopic.aspx.cs" Inherits="postTopic" %>

<%@ Register Assembly="CKEditor.NET" Namespace="CKEditor.NET" TagPrefix="CKEditor" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="ContentPlaceHolder2" Runat="Server">
<!-- 发帖开始 -->
<div class="register_main">
<CKEditor:CKEditorControl ID="CKEditor_TopicContent" runat="server" UIColor="#3E7EBC" Language="zh-cn" EnterMode="BR" MaxLength="800" Columns="100" ForcePasteAsPlainText="true" ToolbarLocation="Top" ToolbarCanCollapse="true" Toolbar="[['Source','-','NewPage'],['Cut','Copy','Paste','PasteText','PasteFromWord','-','SpellChecker', 'Scayt'],['Undo','Redo','-','Find','Replace','-','SelectAll','RemoveFormat'],['Link','Unlink','Anchor'],['Bold','Italic','Underline','Strike','-','Subscript','Superscript'], ['NumberedList','BulletedList','-','Outdent','Indent','Blockquote'],['JustifyLeft','JustifyCenter','JustifyRight','JustifyBlock'],['Image','Flash','Table','HorizontalRule','Smiley','SpecialChar','PageBreak'],['Styles','Format','Font','FontSize'],['TextColor','BGColor']]" ></CKEditor:CKEditorControl>
<div>