Issue setting focus in dynamically loaded user control

Hello everyone,

I'm having a bit of an issue in my ASP.Net application moving focus from a textbox in one user control to a text box in the next user control on the page after postback. I’ve searched high and low over the last several days to find a solution but, for whatever reason, have been unable to do so. Any help that any of you can provide would be very much appreciated.

Here are the details of the application:
The issue:
I created a much simplified example of the scenario described above and was able to consistently reproduce the “bad” focus behavior.  All of the ajax toolkit controls and code where stripped out of the sample to rule the toolkit out as a cause. The behavior still occurs without the toolkit.

I am including the code for default.aspx and WebUserControl1.ascx.  

Thanks,
Kelly

default.aspx
<%@ Page Title="Home Page" Language="vb" MasterPageFile="~/Site.Master" AutoEventWireup="false"
    CodeBehind="Default.aspx.vb" Inherits="WebApplication1._Default" %>

<%@ Register src="WebUserControl1.ascx" tagname="WebUserControl1" tagprefix="uc1" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
    <asp:Panel ID="Panel1" runat="server">
    </asp:Panel>
</asp:Content> 

default.aspx.vb
Public Class _Default
    Inherits System.Web.UI.Page

    Private Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
        For x As Int64 = 1 To 20
            Dim Control As New WebUserControl1
            Control = LoadControl("WebUserControl1.ascx")
            Control.ID = "UserControl" & x.ToString
            Me.Panel1.Controls.Add(Control)

            AddHandler Control.ControlDataSaved, AddressOf Me.Operations_ControlDataSaved
        Next
    End Sub
    Protected Sub Operations_ControlDataSaved(ByVal sender As Object, ByVal e As EventArgs)
        For x As Int64 = 0 To Me.Panel1.Controls.Count - 1
            If Me.Panel1.Controls.Item(x).ID = sender.ID Then

                Dim Control As WebUserControl1 = Me.Panel1.FindControl(Me.Panel1.Controls.Item(x + 1).ID)
                Control.FindControl("Textbox1").Focus()

                ''' This code behaves the same way as the uncommented code.
                'Dim ControlID As String = Me.Panel1.Controls.Item(x + 1).ClientID & "_TextBox1"
                'Dim sm As ScriptManager = ScriptManager.GetCurrent(Me)
                'sm.SetFocus(ControlID)

                Exit For
            End If
        Next
    End Sub
End Class

WebUserControl1.ascx
<%@ Control Language="vb" AutoEventWireup="false" CodeBehind="WebUserControl1.ascx.vb" Inherits="WebApplication1.WebUserControl1" %>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
    <ContentTemplate>
        <asp:Panel ID="Panel1" runat="server" DefaultButton="Button1">
            <asp:TextBox ID="TextBox1" runat="server" TabIndex="1"></asp:TextBox>
            <asp:Button ID="Button1" runat="server" Text="Button" TabIndex="-1" />
        </asp:Panel>
    </ContentTemplate>
</asp:UpdatePanel>

WebUserControl.ascx.vb
Public Class WebUserControl1
    Inherits System.Web.UI.UserControl

    Public Event ControlDataSaved As EventHandler

    Protected Sub OnControlDataSaved(ByVal e As EventArgs)
        RaiseEvent ControlDataSaved(Me, e)
    End Sub
    Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Me.OnControlDataSaved(e)
    End Sub
End Class

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