multipage为什么不能显示datagrid?

我用tapstrip结合multipage作了个示例，发现datagrid放入后不能显示，可以显示其他label,table之类的东西，不知是什么原因？
<%@ Register TagPrefix="iewc" Namespace="Microsoft.Web.UI.WebControls" Assembly="Microsoft.Web.UI.WebControls, Version=1.0.2.226, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %>
<%@ Page Language="vb" AutoEventWireup="false" Codebehind="RainValues.aspx.vb" Inherits="FHTree.RainValues"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<title>RainValues</title>
<meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" content="Visual Basic .NET 7.1">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<FONT face="宋体">
<DIV style="DISPLAY: inline; Z-INDEX: 101; LEFT: 84px; WIDTH: 145px; POSITION: absolute; TOP: 32px; HEIGHT: 23px"
ms_positioning="FlowLayout">雨量计雨量分布</DIV>
<iewc:TabStrip id="TabStrip1" style="Z-INDEX: 102; LEFT: 48px; POSITION: absolute; TOP: 79px" runat="server"
Width="367px" Height="29px" TabSelectedStyle="background-color:#ffffff;color:#000000" TabHoverStyle="background-color:#777777"
TabDefaultStyle="background-color:#000000;font-family:verdana;font-weight:bold;font-size:8pt;color:#ffffff;width:79;height:21;text-align:center"
TargetID="MultiPage1" Font-Size="Large">
<iewc:Tab Text="雨量计雨量分布"></iewc:Tab>
<iewc:Tab Text="气象中心雨量"></iewc:Tab>
</iewc:TabStrip>
<iewc:MultiPage id="MultiPage1" style="Z-INDEX: 103; LEFT: 41px; POSITION: absolute; TOP: 116px"
runat="server" Width="564px" Height="495px" BackColor="#C0C0FF">
<iewc:pageview>
<DIV style="DISPLAY: inline; Z-INDEX: 102; LEFT: 84px; WIDTH: 145px; POSITION: absolute; TOP: 32px; HEIGHT: 23px"
ms_positioning="FlowLayout">雨量计雨量分布</DIV>
</iewc:pageview>
<iewc:pageview>
<TABLE id="Table1" style="Z-INDEX: 104; LEFT: 11px; WIDTH: 111px; POSITION: absolute; TOP: 74px; HEIGHT: 36px"
cellSpacing="1" cellPadding="1" width="300" border="1">
<TR>
<TD align="center">
<asp:Label id="Label1" runat="server" Width="477px" Height="19px">Label</asp:Label></TD>
</TR>
<TR>
<td>
<asp:DataGrid id="DataGrid11" runat="server" Width="375px" Height="174px" AutoGenerateColumns="False">
<Columns>
<asp:BoundColumn DataField="工务段" ReadOnly="True" HeaderText="工务段"></asp:BoundColumn>
<asp:BoundColumn DataField="工区名称" ReadOnly="True" HeaderText="工区"></asp:BoundColumn>
<asp:BoundColumn DataField="日雨量" HeaderText="日雨量"></asp:BoundColumn>
<asp:BoundColumn DataField="抄表日期" HeaderText="抄表时间"></asp:BoundColumn>
</Columns>
</asp:DataGrid>
<asp:datagrid id="Datagrid1" runat="server" Width="496px" Height="306px" AutoGenerateColumns="False"
BackColor="#E0E0E0" AllowPaging="True" PageSize="12" BorderColor="Navy">
<AlternatingItemStyle BackColor="#99CCCC"></AlternatingItemStyle>
<HeaderStyle HorizontalAlign="Center" ForeColor="Navy" BackColor="#C0C0FF"></HeaderStyle>
<Columns>
<asp:BoundColumn DataField="路段" HeaderText="路段"></asp:BoundColumn>
<asp:BoundColumn DataField="范围" HeaderText="范围"></asp:BoundColumn>
<asp:BoundColumn DataField="天气现象" HeaderText="天气现象"></asp:BoundColumn>
<asp:BoundColumn DataField="降雨" HeaderText="降雨"></asp:BoundColumn>
<asp:BoundColumn DataField="气温" HeaderText="气温"></asp:BoundColumn>
<asp:BoundColumn DataField="风力" HeaderText="风力"></asp:BoundColumn>
<asp:BoundColumn DataField="备注" HeaderText="备注"></asp:BoundColumn>
</Columns>
<PagerStyle Mode="NumericPages"></PagerStyle>
</asp:datagrid></td>
</TR>
<TR>
<TD></TD>
</TR>
</TABLE>
</iewc:pageview>
</iewc:MultiPage>
</FONT>
</form>
</body>
</HTML>