sharepoint2010的弹出等待提示的对话框

根据MSDN的资料。我做了个测试，代码如下：

<%@ Assembly Name="$SharePoint.Project.AssemblyFullName$" %>
<%@ Assembly Name="Microsoft.Web.CommandUI, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %> 
<%@ Register Tagprefix="SharePoint" Namespace="Microsoft.SharePoint.WebControls" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %> 
<%@ Register Tagprefix="Utilities" Namespace="Microsoft.SharePoint.Utilities" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Register Tagprefix="asp" Namespace="System.Web.UI" Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %>
<%@ Import Namespace="Microsoft.SharePoint" %> 
<%@ Register Tagprefix="WebPartPages" Namespace="Microsoft.SharePoint.WebPartPages" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="screenVisualWebPart.ascx.cs" Inherits="SharePointProject1.screenVisualWebPart.screenVisualWebPart" %>
<input id="Button1" type="button" value="不带关闭的功能" οnclick="test();" />
<input id="Button2" type="button" value="带关闭的功能" οnclick="testClose();" />
<script Lanague="javscript" type="text/javascript">
<!--function test() {var value = SP.UI.ModalDialog.showWaitScreenWithNoClose("测试", "正在等待....", 200, 300);}function testClose() {var value = SP.UI.ModalDialog.showWaitScreenSize("测试", "正在等待....", 200, 300);}
//-->
</script>