load the tabpanel to dynamic title, But the title not show?

[GeoffreyRen]

    this.Details.Header = true;
    this.Details.SetTitle(group.G_CName);
    string url = "Render.aspx?GroupID=" + groupID.ToString(); 
    LoadConfig load_config = new LoadConfig(url, LoadMode.IFrame, false);
            
    Details.LoadContent(load_config);

</PRE>

    <Center>
        <ext:TabPanel ID="Details" runat="server" EnableTabScroll="true">
                   
        </ext:TabPanel>
    </Center>

</PRE>