Yes, everything compiles and runs fine. (I wonder if this is some silly setting in VS rather than Coolite!).
Here is the code (An empty code behind will be fine):
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register Assembly="Coolite.Ext.Web" Namespace="Coolite.Ext.Web" TagPrefix="ext" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Coolite Test</title>
<link rel="stylesheet" type="text/css" href="css/screen.css" media="screen" title="screen" />
</head>
<body>
<form id="form1" runat="server">
<ext:ScriptManager ID="ScriptManager1" runat="server" Theme="Gray"/>
<ext:ViewPort ID="ViewPort1" runat="server">
<Content>
<ext:BorderLayout ID="BorderLayout1" runat="server">
<North Collapsible="True" Split="True">
<ext:Panel ID="NorthPanel" runat="server" Height="150" Title="Site Search" Collapsed="true" BodyStyle="padding:6px;">
</ext:Panel>
</North>
<East Collapsible="true" Split="true">
<ext:Panel ID="EastPanel" runat="server" Title="East" Width="175" BodyStyle="padding:6px;">
<Content>
<ext:FitLayout ID="FitLayout1" runat="server">
<ext:TabPanel runat="server" ActiveTab="0" Border="false" TabPosition="Bottom" Title="Title">
<tabs>
<ext:Tab runat="server" Title="Tab 1">
<content>
<div id="siteContacts">
<h3>Site Contacts</h3>
<asp:DataList ID="ContactsDataList" runat="server">
<itemtemplate>
<div class="siteContactName">
<asp:LinkButton ID="ContactNameLinkButton" runat="server"><%# DataBinder.Eval(Container.DataItem,"name")%></asp:LinkButton>
<div class="siteContactPhone">
<%# DataBinder.Eval(Container.DataItem,"phone")%>
</itemtemplate>
</asp:DataList>
</content>
</ext:Tab>
<ext:Tab runat="server" Title="Tab 2" />
</tabs>
</ext:TabPanel>
</ext:FitLayout>
</Content>
</ext:Panel>
</East>
<South Collapsible="true" Split="true" >
<ext:Panel ID="Panel3" runat="server" Height="150" Title="South" BodyStyle="padding:6px;" AutoScroll="true" >
<Content>
<asp:Literal ID="CommentsLiteral" runat="server"></asp:Literal>
</Content>
</ext:Panel>
</South>
<West Collapsible="true" Split="true">
<ext:Panel ID="WestPanel" runat="server" Title="West" Width="175" BodyStyle="padding:6px;">
<Content>
<ext:Accordion ID="Accordion1" runat="server" Animate="true">
<ext:Panel runat="server" Border="false" Collapsed="True" Icon="FolderGo" Title="Item 1">
</ext:Panel>
<ext:Panel runat="server" Border="false" Collapsed="true" Icon="FolderWrench" Title="Item 2">
</ext:Panel>
</ext:Accordion>
</Content>
</ext:Panel>
</West>
<Center>
<ext:Panel ID="CenterPanel" runat="server" Title="Center" BodyStyle="padding:6px;">
<Content>
<ext:FitLayout ID="FitLayout2" runat="server">
<ext:TabPanel runat="server" ActiveTab="0" Border="false" Title="Center">
<tabs>
<ext:Tab runat="server" Title="Tab 1" Closable="true">
<content>
<div style="width:550px">
<div class="row">
Address:
<asp:Literal ID="FullAddressLiteral" runat="server"></asp:Literal>
<div class="row">
Parent Site:
<a href ="">Parent Site</a>
<div class="row">
References:
<asp:Literal ID="ReferencesLiteral" runat="server"></asp:Literal>
<div class="row">
Departments:
<asp:Literal ID="DepartmentsLiteral" runat="server"></asp:Literal>
</content>
</ext:Tab>
<ext:Tab runat="server" Title="Tab 2" />
</tabs>
</ext:TabPanel>
</ext:FitLayout>
</Content>
</ext:Panel>
</Center>
</ext:BorderLayout>
</Content>
</ext:ViewPort>
</form>
</body>
</html>