Mi spiegate perchè il codice che posto, in una pagina asp.net normale mi fa gestire il <PagerTemplate> e in un user control no. Non riesco neanche a vedere i controlli presenti nel tag, nel lato codice ?

<%@ Control Language="VB" AutoEventWireup="false" CodeFile="DropDownTecnico.ascx.vb" Inherits="DropDownTecnico" %>
<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="cc1" %>


<link href="css/StyleSlide.css" rel="stylesheet" type="text/css" />
<link href="css/StyleDropDownMetodo.css" rel="stylesheet" type="text/css" />
<style type="text/css">

#divTxtMetodoUc
{
overflow:auto;
width: 736px;
height: 198px;
margin: 0px solid black;
}
.gridcell1
{
WIDTH: 340px;
}

.gridcell2
{
WIDTH: 350px;
}

.gridcell3
{
WIDTH: 20px;
}


</style>

<asp:UpdatePanel ID="UpdatePanelMetodo" runat="server" ChildrenAsTriggers="true" UpdateMode="Always" RenderMode="Inline" >
<ContentTemplate>
<div>
<asp:Table id="tb" runat="server" cellpadding="0" cellspacing="0" BorderWidth="0px" BackColor="Transparent">
<asp:TableRow BorderWidth="0" BackColor="Transparent">
<asp:TableCell BorderWidth="0" BackColor="Transparent">
<asp:TextBox ID="TxtMetodoUc" runat="server" Wrap="False" Enabled="True" ReadOnly="True"
Font-Names="bioconsult"></asp:TextBox>
<asp:ImageButton ID="IDImmagine" runat="server" OnClientClick="return false;"
ImageAlign="AbsMiddle" BorderStyle="None" TabIndex="-10" />
<asp:ImageButton ID="ImgPopUp" runat="server"
ImageAlign="AbsMiddle" BorderStyle="None" TabIndex="-11" />
</asp:TableCell>
</asp:TableRow>

</asp:Table>
</div>

<asp:Panel ID="Panel1" runat="server" style="display:none;visibility:hidden; background:red;"
BorderWidth="1px" Width="736px" height="198px" BorderColor="#666666">
<div id="divTxtMetodoUc">
<asp:GridView ID="DropDownList1" runat="server"
GridLines="None"
CssClass="mGrid"
Selectedindex="0"
BorderWidth="1px"
DataSourceID="SqlDataSource1"
onselectedindexchanging="DropDownList1_SelectedInd exChanging"
DataKeyNames="ID, Nominativo, Livello"
AllowSorting="True"
AutoGenerateColumns="False"
HeaderStyle-CssClass="gridViewHeader"
HeaderStyle-Height="10" AllowPaging="True"
PageSize="8" >
<PagerTemplate>
<asp:TextBox ID="txtSlider" runat="server" AutoPostBack="True" Text="<%# DropDownList1.PageIndex + 1 %>">
</asp:TextBox>
<cc1:SliderExtender ID="SliderExtender1" runat="server"
Orientation="Horizontal"
RailCssClass="slider_rail"
HandleCssClass="slider_handle"
TargetControlID="txtSlider" >
</cc1:SliderExtender>
</PagerTemplate>

<Columns>
<asp:ButtonField DataTextField="Nominativo"
Text="Pulsante"
SortExpression="Nominativo"
ItemStyle-VerticalAlign="Top"
ControlStyle-Font-Underline="false"
HeaderText="Nominativo" ItemStyle-Wrap="False">
<ControlStyle Font-Underline="False" Font-Names="BioConsult">
</ControlStyle>
<HeaderStyle Font-Names="BioConsult" />
<ItemStyle CssClass="gridcell1" />
</asp:ButtonField>
<asp:ButtonField DataTextField="Livello"
Text="Pulsante"
SortExpression="Livello"
ItemStyle-VerticalAlign="Top"
ControlStyle-Font-Underline="false"
HeaderText="Livello" ItemStyle-Wrap="False">
<ControlStyle Font-Underline="False" Font-Names="Courier New" ></ControlStyle>
<FooterStyle Font-Names="Courier New" />
<HeaderStyle Font-Names="Courier New"></HeaderStyle>
<ItemStyle CssClass="gridcell2" />
</asp:ButtonField>
<asp:ButtonField DataTextField="ID"
Text="Pulsante"
SortExpression="ID"
ItemStyle-VerticalAlign="Top"
ControlStyle-Font-Underline="false"
HeaderText="ID" ItemStyle-Wrap="False"
Visible="True" >
<ControlStyle Font-Underline="False"></ControlStyle>
<ItemStyle CssClass="gridcell3" />
</asp:ButtonField>
</Columns>

</asp:GridView>
</div>
</asp:Panel>


<cc1opupcontrolextender ID="PopupControlExtender1" runat="server"
TargetControlID="IDImmagine"
BehaviorID="pop3"
PopupControlID="Panel1"
CommitProperty="value"
Position="Bottom" OffsetX="-50" OffsetY="-2" >
</cc1opupcontrolextender>

<asp:SqlDataSource ID="SqlDataSource1" runat="server"
EnableViewState="False"
ConnectionString="<%$ ConnectionStrings:BioConnectionString %>"
SelectCommand="SELECT Cognome AS [Nominativo], DescrizioneLivello AS [Livello], ID FROM [TabAnagraficaTecnici]" >
</asp:SqlDataSource>

</ContentTemplate>
</asp:UpdatePanel>