Ajax updatepanel + master page

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ASP.NET

Ajax

Hi all,

I am working with masterpages + updatepanel + timer control in asp.net.
On timer control i am setting my label to visible=false which is inside updatepanel after some interval of time.
When applying with updatepanel + timer control then it works properly refreshing only updatepanel. But when working with masterpages instead of update panel complete page gets refreshed.

Source Code

<asp:updatepanel id="UpdatePanel1" runat="server" updatemode="Conditional" childrenastriggers="true" xmlns:asp="#unknown">
                                               <contenttemplate>
                                                   <asp:label id="lbl_msg" runat="server" forecolor="Red" font-bold="False" font-size="Small"></asp:label>
                                                   <asp:timer id="Timer1" runat="server" interval="5000">
                                                   </asp:timer>
                                               </contenttemplate>
                                               <triggers>
                                                   <asp:asyncpostbacktrigger controlid="Timer1" eventname="Tick" />
                                               </triggers>
                                           </asp:updatepanel>

and timer1_tick code is as follows :

Protected Sub Timer1_Tick(ByVal sender As Object, ByVal e As EventArgs) Handles Timer1.Tick
       Dim time1 As TimeSpan = New TimeSpan
       time1 = Convert.ToDateTime(Session("time")) - DateTime.Now
       If time1.Seconds <= 0 Then
           lbl_msg.Text = ""
       Else
       End If
   End Sub

My requirement is to only refresh only update panel instead of complete page.

Any help is greatly appreciated
Thanx