How to creat a dynamic event in under the tab control.(C#.NET)

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C#3.5

<igtab:Tab Key="K2" Text="Section K2" >
                                                        <ContentTemplate>
                                                        <asp:UpdatePanel ID="updatepanel2" runat="server" OnLoad="UpdatePanel2_Load" UpdateMode="Conditional">
                                                        <ContentTemplate>
                                                        <uc1:usrNfBasic5 id="UsrNfBasic5" runat="server"></uc1:usrNfBasic5>
                                                            </ContentTemplate>
                                                            </asp:UpdatePanel>
                                                    </ContentTemplate>
                                                        <Style BackColor="Transparent">
                                                        </Style>
                                                    </igtab:Tab>

i have use this above code ..i want without using any button event to load that update panel only. not load for whole aspx page..that tab only i need to postback..

<uc1:usrnfbasic5 xmlns:uc1="#unknown"> is a tag for user control registerd used here