How do I set focus to a textbox inside a Gridview Footer inside an UpdatePanel?

I am using a footer in a GridView to "add" items to the gridview via a textbox and button combination and the GridView is inside an UpdatePanel.  That's working fine.  

What I would like to do is have the textbox receive focus after the partial page update.  How can I do that?

Is there an event on the UpdatePanel I can capture/code that will do this?
<asp:UpdatePanel ID="upnlEditUsers" runat="server">             
            <ContentTemplate>             
                <asp:Panel ID="pnlUsers" runat="server" Height="300" style="text-align:left;">                     
                    <asp:GridView ID="gvUsers" runat="server"                              
                            CellPadding="3"  CellSpacing="0"
                            Width="350px" 
                            PagerStyle-HorizontalAlign="center"                          
                            AutoGenerateColumns="false"                                                                                
                             ShowFooter="true"
                            ShowHeader="true" 
                            OnRowCommand="gvUsers_RowCommand" 
                            DataKeyNames="PersonID, RequestID" 
                            OnRowDataBound="gvUsers_RowDataBound" 
                        >
                        <AlternatingRowStyle CssClass="altRowStyle" />
                        <RowStyle CssClass="RowStyle" />
                        <HeaderStyle CssClass="HeaderStyle" />
                        <SelectedRowStyle CssClass="SelectedRowStyle" />
                        <PagerStyle CssClass="PagerStyle" />                                                        
                        <EmptyDataRowStyle />                    
                        <Columns>                                             
                            <asp:TemplateField HeaderText="User(s)"  ItemStyle-HorizontalAlign="Left">
                                <ItemTemplate>
                                    <asp:Label ID="lblUserFullName" runat="server" Text='<%# Bind("UserFullName") %>'></asp:Label> 
                                </ItemTemplate>                           
                               <FooterTemplate>
                                    <asp:TextBox ID="tbxPersonSearch" runat="server" ></asp:TextBox>                                                                 
                                    <cc1:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server" MinimumPrefixLength="3"
                                        TargetControlID="tbxPersonSearch"                      
                                        ServiceMethod="PersonSearchLastName" ServicePath="~/WebServices/AutoComplete.asmx"                     
                                        CompletionSetCount="30"
                                        OnClientItemSelected="PersonSearchItemSelected" 
                                        FirstRowSelected="false"
                                        >                                                                                       
                                    </cc1:AutoCompleteExtender> 
                                    <asp:Button ID="btnAddPersonToRequest" Text="Add" runat="server" OnClick="btnAddPersonToRequest_Click" OnClientClick="javascript:EnableValidators(false);" />
                               </FooterTemplate>
                            </asp:TemplateField>                           
                            <asp:TemplateField HeaderStyle-BorderColor="#CCCCCC" ItemStyle-BorderColor="#CCCCCC"
                                    ItemStyle-HorizontalAlign="center" Visible="true">
                                    <ItemTemplate>
                                        <asp:ImageButton AlternateText="Remove User" ID="btnRemoveUser" ImageUrl="~/Images/delete.ico"
                                            CausesValidation="false" CommandName="Remove" CommandArgument='<%# Bind("PersonID") %>'
                                            runat="server" />
                                    </ItemTemplate>
                            </asp:TemplateField>                                
                        </Columns>              
                        <EmptyDataTemplate> 
                            <div style="margin: 5px 5px 5px;" ><asp:Label ID="lblNoUsers" Text="There are no users associated with this request." runat="server"></asp:Label></div>
                            <asp:TextBox ID="tbxPersonSearch" style="margin-left: 5px;" runat="server"  ></asp:TextBox>                                                                 
                                    <cc1:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server" MinimumPrefixLength="3"
                                        TargetControlID="tbxPersonSearch"                      
                                        ServiceMethod="PersonSearchLastName" ServicePath="~/WebServices/AutoComplete.asmx"                     
                                        CompletionSetCount="30"
                                        OnClientItemSelected="PersonSearchItemSelected" 
                                        FirstRowSelected="true"
                                        >                                                                                       
                                    </cc1:AutoCompleteExtender> 
                                    <asp:Button ID="btnAddPersonToRequest" Text="Add" runat="server" OnClick="btnAddPersonToRequest_Click" />
                        </EmptyDataTemplate>                    
                    </asp:GridView>                                        
               </asp:Panel>
             </ContentTemplate>  
           </asp:UpdatePanel>

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G0ggyCommented:
Try this:

<script language="JavaScript" type="text/javascript">
function doSomething() {
 if (request.readyState == 4) {
  form1.txtInput2.focus();
  }
 }
</script>
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Dov_LandauCommented:
You can use UpdatePanel.Load Event. Something like the code below:
Please Notice that you should use the ScriptManager.SetFocus Method!

<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
    <div>
        <asp:UpdatePanel ID="MyUpdatePanel" runat="server" onload="MyUpdatePanel_Load">
            <ContentTemplate>
                <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
            </ContentTemplate>
            <Triggers>
                <asp:AsyncPostBackTrigger ControlID="MyButton" EventName="Click" />
            </Triggers>
        </asp:UpdatePanel>
        
        <asp:Button ID="MyButton" runat="server" />
        <asp:Button ID="Button1" runat="server" Text="äê× çÕÑå" OnClick="btnPrint_Click" />
    </div>
    </form>
</body>
 
and here is the c# Code.
========================
   protected void MyUpdatePanel_Load(object sender, EventArgs e)
    {
        ScriptManager1.SetFocus(TextBox1);
    }

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