The error msg was tabStrip_is_undefined and multipage_is_undefined
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<TABLE height="200" width="100%">
<tr>
<td><div style="OVERFLOW:auto; WIDTH:88.27%; HEIGHT:280px">
<asp:datagrid id="MaritalGrid" style="Z-INDEX: 103; LEFT: 8px; POSITION: absolute; TOP: 8px" runat="server"
AllowSorting="True" CellPadding="3" BorderWidth="1px" CellSpacing="2" BorderStyle="None" BorderColor="#DEBA84"
AllowPaging="True" PageSize="15" BackColor="#DEBA84" Height="676px" Width="496px" AutoGenerateColumns="False"
OnItemDataBound="MaritalGrid_ItemDataBoundDoubleClick">
<SelectedItemStyle Font-Bold="True" ForeColor="White" BackColor="#738A9C"></SelectedItemStyle>
<ItemStyle ForeColor="#8C4510" BackColor="#FFF7E7"></ItemStyle>
<HeaderStyle Font-Bold="True" ForeColor="White" BackColor="#A55129"></HeaderStyle>
<FooterStyle ForeColor="#8C4510" BackColor="#F7DFB5"></FooterStyle>
<Columns>
<asp:HyperLinkColumn Target="_blank" DataNavigateUrlField="MaritalStatus" DataNavigateUrlFormatString="Maritalupdate.aspx?id={0}"
DataTextField="MaritalStatus" SortExpression="Gender" HeaderText="Marital Status"></asp:HyperLinkColumn>
<asp:TemplateColumn>
<ItemTemplate>
<asp:LinkButton id="cmdDel" runat="server" CommandName="Delete" Text="Delete" CausesValidation="false"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="Test">
<ItemTemplate>
<asp:dropdownlist runat="server" DataTextField="MaritalStatus" DataValueField="MaritalStatus" DataSource="<%#GetData()%>" SelectedIndex='<%#GetselIndex(Databinder.eval(Container,"DataItem.MaritalStatus"))%>' ID="Dropdownlist1">
</asp:dropdownlist>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.MaritalStatus") %>' ID="Textbox1">
</asp:TextBox>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="Test2">
<ItemTemplate>
<div onClick='javascript:window.navigate("maritalUpdate.aspx?id=<%# Container.DataItem("MaritalStatus") %>")'><%# Container.DataItem("MaritalStatus") %></div>
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="Test3">
<ItemTemplate>
<asp:Label runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.MaritalStatus") %>'>
</asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" id ="TestColumn" Text='<%# DataBinder.Eval(Container, "DataItem.MaritalStatus") %>'>
</asp:TextBox>
</EditItemTemplate>
</asp:TemplateColumn>
</Columns>
<PagerStyle HorizontalAlign="Center" ForeColor="#8C4510" Mode="NumericPages"></PagerStyle>
</asp:datagrid>
</div>
<P>
<asp:label id="lbltest" runat="server"></asp:label></P>
<P>
<asp:hyperlink id="hylinsert" runat="server" NavigateUrl="maritalinsert.aspx" Target="_blank" Font-Size="15pt">Insert</asp:hyperlink></P>
</td>
</tr>
</TABLE>
</form>
<iewc:TreeView id="TreeView1" runat="server">
<iewc:TreeNode Text="Node1">
<iewc:TreeNode Text="Node2">
<iewc:TreeNode Text="Node4">
<iewc:TreeNode Text="Node7"></iewc:TreeNode>
</iewc:TreeNode>
<iewc:TreeNode Text="Node8"></iewc:TreeNode>
</iewc:TreeNode>
<iewc:TreeNode Text="Node5">
<iewc:TreeNode Text="Node6"></iewc:TreeNode>
</iewc:TreeNode>
</iewc:TreeNode>
</iewc:TreeView>
<asp:Panel id="Panel1" style="Z-INDEX: 102; LEFT: -32000px; POSITION: absolute; TOP: -32000px"
runat="server" Width="176px" Height="56px">Panel</asp:Panel>
<iewc:TabStrip TargetID="MultiPage1" id="TabStrip2" runat="server" 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">
<iewc:Tab Text="Tab 1"></iewc:Tab>
<iewc:Tab Text="Tab 2"></iewc:Tab>
<iewc:Tab Text="Tab 3"></iewc:Tab>
<iewc:TabSeparator></iewc:TabSeparator>
<iewc:TabSeparator></iewc:TabSeparator>
</iewc:TabStrip>
<iewc:MultiPage id="MultiPage1" runat="server">
<iewc:pageview>1</iewc:pageview>
<iewc:pageview>2</iewc:pageview>
<iewc:pageview>3</iewc:pageview>
</iewc:MultiPage>
</body>