自定义Pager 在其他控件中动态加载时 页面第一次打开不显示页数，点击下页等才显示

代码

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="Pager.ascx.cs" Inherits="Pager" %>

<table style="width:90%;">

    <tr>

        <td style="text-align: center">

            第<asp:Label ID="lblPageIndex" runat="server" Text="<%#((GridView)Container.Parent.Parent).PageIndex + 1 %>"></asp:Label>页

            共<asp:Label ID="lblPageCount" runat="server" Text="<%# ((GridView)Container.Parent.Parent).PageCount %>"></asp:Label>页

            <asp:LinkButton ID="btnFirst" runat="server" CausesValidation="False" CommandArgument="First"

                CommandName="Page" Text="首页" Enabled="<%# ((GridView)Container.Parent.Parent).PageIndex!=0 %>"></asp:LinkButton>

            <asp:LinkButton ID="btnPrev" runat="server" CausesValidation="False" CommandArgument="Prev"

                CommandName="Page" Text="上一页" Enabled="<%# ((GridView)Container.Parent.Parent).PageIndex!=0 %>"></asp:LinkButton>

            <asp:LinkButton ID="btnNext" runat="server" CausesValidation="False" CommandArgument="Next"

                CommandName="Page" Text="下一页" Enabled="<%# ((GridView)Container.Parent.Parent).PageIndex!=((GridView)Container.Parent.Parent).PageCount-1 %>"></asp:LinkButton>

            <asp:LinkButton ID="btnLast" runat="server" CausesValidation="False" CommandArgument="Last"

                CommandName="Page" Enabled="<%# ((GridView)Container.Parent.Parent).PageIndex!=((GridView)Container.Parent.Parent).PageCount-1 %>"

                Text="尾页"></asp:LinkButton>

            <asp:TextBox ID="txtNewPageIndex" runat="server" onkeyup="value=value.replace(/[^\d]/g,'') "

                Text="<%# ((GridView)Container.Parent.Parent).PageIndex + 1%>" Width="20px"></asp:TextBox>

            <%--<asp:LinkButton ID="btnGo" runat="server" CausesValidation="False" CommandArgument="-1"

                CommandName="Page" Text="GO"></asp:LinkButton>--%>

        </td>

    </tr>

</table>

但是在别的控件中加载，头次打开页面就不显示了
代码

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="SwitchCtrl.ascx.cs" Inherits="SwitchCtrl" %>

<asp:PlaceHolder ID="UserCtrlPlaceHolder" runat="server"></asp:PlaceHolder>

        protected void Page_Load(object sender, EventArgs e)

        {

            UserControl uc = new UserControl();

            uc = Page.LoadControl("Pager.ascx") as UserControl;

            uc.ID = "UserControl";

            UserCtrlPlaceHolder.Controls.Add(uc);

         ｝

在使用以上控件的页中
GridView里间接用的话，第一次显示页面不显示页数，代码如下

            <PagerTemplate>

                <uc1:SwitchCtrl ID="SwitchCtrl2" runat="server" />

            </PagerTemplate>

请问，为什么Page.LoadControl出来的控件工作有问题？