效果图：
html代码：
<ext:Panel ID="Panel4" runat="server" Icon="UserHome" Title="客户信息" Width="885px" Height="555px" Frame="true" >
<Body>
<ext:BorderLayout ID="BorderLayout1" runat="server">
<West Collapsible="true" MinWidth="210" Split="true">
<ext:Panel ID="WestPanel" runat="server" Title="知识中心" Width="210" Frame="true">
<Body>
</Body>
</ext:Panel>
</West>
<Center>
<ext:Panel ID="Panel2" runat="server">
<Body>
<ext:Borderlayout runat="server" ID="BorderLayout2">
<Center>
<ext:Panel ID="Panel3" runat="server" Title="高级检索" Height="210" Frame="true">
<Body>
</Body>
</ext:Panel>
</Center>
<South Split="true" Collapsible="true">
<ext:Panel ID="Panel1" runat="server" Title="高级检索" Height="210" Frame="true">
<Body>
</Body>
</ext:Panel>
</South>
</ext:Borderlayout>
</Body>
</ext:Panel>
</Center>
</ext:BorderLayout>
</Body>
</ext:Panel>