Does anyone know why this is causing a full-page postback instead of just refreshing the section within the update panel?
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="default.aspx.vb" Inherits="pages_edit_default"
MasterPageFile="~/pages/master_page/MasterPage.master" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<h2>
<asp:Label ID="LabelTitle" runat="server" style="font-weight: 700" Text="my-title"></asp:Label>
</h2>
<h3>
<asp:Label ID="LabelTitle0" runat="server" style="font-weight: 700" Text="my-sub-title"></asp:Label>
</h3>
...
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