dynamic web user control gets refreshed by timer event..so i had recreate them in pageload event but how to persist focus in a textbox1

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hi guys..!!!!!!!!!

i am developing chat application..when user click on online users link...the pop up window (dynamic control) will be shown in an update panel.but due to timer event ,after post back dynamically created controls gets deleted from the page..so in a post back event i will again create them with same id's.but due to this whenever i am trying to type in textbox in an user control.after page refresh , focus from textbox gets diverted.so i have to again and again click on tetxbox to type something in it.

timer event is used to find whether new message is came for current user in a database or not.
i think the problem is due to recreation of user control in pageload event.

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


<div style="width: 211px;border:thick solid #ffa800"> 

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
 <ContentTemplate> 
          Hi  <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>..<br />
        <asp:TextBox ID="TextBox2" runat="server" TextMode="MultiLine" Height="172px"  Width="186px"></asp:TextBox><br /><br />
            <asp:Timer ID="Timer1" runat="server" Interval="2000" ontick="Timer1_Tick" Enabled="true">   </asp:Timer>            
</ContentTemplate></asp:UpdatePanel>  </div> 
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
<ContentTemplate> 
       <asp:TextBox ID="TextBox1" runat="server" Width="148px"></asp:TextBox> 
        <asp:Button ID="BtnSend" runat="server" onclick="BtnSend_Click" Text="Send" />   </ContentTemplate>
        </asp:UpdatePanel> 

protected void craetecontrols() // this function is in main page in which i am  adding    above user control
    {
        foreach (DictionaryEntry obj in arr)
        {
            Panel p1 = new Panel();
            p1.ID = "PanelChat" + obj.Key.ToString();
            ChatWindow mycontrol = (ChatWindow)LoadControl("~/ChatWindow.ascx");
            mycontrol.ID = "ChWId" + obj.Key.ToString();
            p1.Controls.Add(mycontrol);
            p1.Style.Add("position", " absolute");
            p1.Style.Add("bottom", "0");
            p1.Style.Add("right", obj.Value.ToString());
            UpdatePanel4.ContentTemplateContainer.Controls.Add(p1);
        }
    }