How to get the updatepanel updated in user control?

Hello,

I am using updatepanel within a user control (serves as my every page's menu) to create a count down session warning:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not IsPostBack Then
            Me.lblSessionRemaining.Text = "Session Remaining Time in Minutes: 30"

            If Not ScriptManager1.IsInAsyncPostBack Then
                Session("timeout") = DateTime.Now.AddMinutes(30).ToString() 'Session expires in 30 minutes
            End If
        End If

    End Sub

    Protected Sub Timer1_Tick(ByVal sender As Object, ByVal e As EventArgs) Handles Timer1.Tick
        If Not Session("timeout") Is Nothing Then
            If 0 > DateTime.Compare(DateTime.Now, DateTime.Parse(Session("timeout").ToString())) Then
                lblSessionRemaining.Text = "Session Remaining Time in Minutes: " & Math.Floor(CType(Session("timeout"), DateTime).Subtract(DateTime.Now).TotalMinutes)
            End If
        End If
    End Sub

<asp:ScriptManager ID="ScriptManager1" EnablePartialRendering="true"  runat="server"></asp:ScriptManager><table class="style1"><tr><td>
            Logo Here</td><td>
            User info<table class="style1"><tr><td>
                        User:<asp:Label ID="lblUsername" runat="server" Text=""></asp:Label></td></tr><tr><td>
                        User Department:<asp:Label ID="lblDeparment" runat="server" Text=""></asp:Label></td></tr>                <tr><td>
                        Last Signon:<asp:Label ID="lblLastSignOn" runat="server" Text=""></asp:Label></td></tr><tr><td>
                        Last failed signon attempt:<asp:Label ID="lblLastFailedSignOn" runat="server" Text=""></asp:Label></td></tr></table></td><td><asp:UpdatePanel 
                ID="UpdatePanel1" runat="server" UpdateMode="Conditional"><ContentTemplate>
                    Session Remaining:<asp:Label ID="lblSessionRemaining" runat="server" Text=""></asp:Label></ContentTemplate><Triggers><asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" /></Triggers></asp:UpdatePanel></td><td><asp:Button ID="btnSignOff" runat="server" Text="Sign Off" /></td></tr></table><asp:Timer ID="Timer1" runat="server" Interval="1000"></asp:Timer>

I followed Microsoft's suggestion to use EnablePartialRendering="true"  in <asp:ScriptManager definition