AjaxFileUpload Inside A Repeater

My .aspx page is like this :

<asp:UpdatePanel ID="UpdatePanel1" runat="server"><ContentTemplate><asp:Repeater ID="Repeater1" runat="server" DataSourceID="SqlDataSource4" OnItemCommand="Repeater1_ItemCommand"><HeaderTemplate><table ID="Table1"></HeaderTemplate><ItemTemplate><tr><td><asp:BulletedList ID="BulletedList1" runat="server" DataSourceID="SqlDataSource6" DataTextField="WPName" DataValueField="WPName"></asp:BulletedList><asp:Button ID="Button2" runat="server" Text="Add KKP" CommandName="AddKKP"/><asp:Panel ID="Panel1" runat="server" Visible="false"><ajaxToolkit:AjaxFileUpload ID="AjaxFileUpload1" runat="server"></ajaxToolkit:AjaxFileUpload></asp:Panel></td></tr></ItemTemplate><FooterTemplate></table></FooterTemplate></asp:Repeater></ContentTemplate></asp:UpdatePanel>

how i declare codeBehind for AjaxFileUpload inside a repeater ? should i use FindControl ? how to throw CommandName from AjaxfileUpload upload button ?

my codeBehind :

protected void Repeater1_ItemCommand(object source, RepeaterCommandEventArgs e)
        {
            if (e.CommandName == "AddKKP")
            {
                Panel myPanel = (Panel)e.Item.FindControl("Panel1");
                myPanel.Visible = true;
            }
	}

Any sugestions ?

Thanks for your help.

Best Regards.