Hi,
Here's a sample which demonstrates one technique. I've built using the new v1.0 (to be released soon) since it includes the new HBoxLayout and many new syntax optimizations. You should be able to configure approx the same layout using the ColumnLayout.
Example
<%@ Page Language="C#" AutoEventWireup="true" %>
<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" 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>Ext.NET Example</title>
</head>
<body>
<form runat="server">
<ext:ResourceManager runat="server" />
<ext:Viewport runat="server" Layout="fit">
<Items>
<ext:TabPanel runat="server">
<Items>
<ext:Panel runat="server" Title="Project" Padding="5">
<Items>
<ext:Container runat="server" Layout="hbox" StyleSpec="margin-bottom:5px;">
<Items>
<ext:FormPanel
runat="server"
Title="Information"
Height="300"
Collapsible="true"
Flex="2"
Padding="5"
StyleSpec="padding-right:5px;">
<Items>
<ext:DisplayField runat="server" FieldLabel="Name" Text="--/--" />
<ext:TextField runat="server" FieldLabel="Description" Text="OH Acasa studentenhuisvesting" />
</Items>
</ext:FormPanel>
<ext:Container runat="server" Flex="1" DefaultCollapsible="true" AutoHeight="true">
<Items>
<ext:Panel runat="server" Title="Actions" Height="100" StyleSpec="margin-bottom:5px;" />
<ext:Panel runat="server" Title="History" Height="100" StyleSpec="margin-bottom:5px;" />
<ext:Panel runat="server" Title="Project Hours Status" Height="100" StyleSpec="margin-bottom:5px;" />
<ext:Panel runat="server" Title="Kwaliteits Formulieren" Height="100" />
</Items>
</ext:Container>
</Items>
</ext:Container>
<ext:Container runat="server" Layout="hbox">
<Items>
<ext:Container runat="server" Flex="1" StyleSpec="padding-right:5px;">
<Items>
<ext:Panel runat="server" Title="Date Information" Height="100" Collapsible="true" StyleSpec="margin-bottom:5px;" />
<ext:Panel runat="server" Title="Invoicing" Height="100" Collapsible="true" />
</Items>
</ext:Container>
<ext:Panel runat="server" Title="Navigate Project" Height="400" Collapsible="true" Flex="2" />
</Items>
</ext:Container>
</Items>
</ext:Panel>
<ext:Panel runat="server" Title="Calculations" />
<ext:Panel runat="server" Title="BOM" />
<ext:Panel runat="server" Title="Purchase" />
<ext:Panel runat="server" Title="Activities" />
</Items>
</ext:TabPanel>
</Items>
</ext:Viewport>
</form>
</body>
</html>
I'll take a screen capture of what the above renders and post.