If you want to run this example from VS.NET project you need to change in file vb_inside_usercontrol.ascx the following line
<%@ Control Language="vb" Src="vb_inside_usercontrol.ascx.vb" Inherits="EM_Examples.vb_inside_usercontrol" %>
to
<%@ Control Language="vb" CodeBehind="vb_inside_usercontrol.ascx.vb" Inherits="EM_Examples.vb_inside_usercontrol" %>