I have the following ASPX page.
I want to be able to add an extended ComboBox control into Panel3 Items. I want to be able to add this through HTML code.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<form id="form1" runat="server">
<ext:ResourceManager runat="server" ID="ResourceManager1">
<ext:Panel ID="Panel3" runat="server" Border="true" Layout="form" Height="300px" width="300px">