Hi, How do i set a PropertyPanel description text i .net?

I currently have:

aspx file

<%@ Register Namespace="umbraco" Assembly="umbraco" TagPrefix="umb"%>

<%@ Register Namespace="umbraco.uicontrols" Assembly="controls" TagPrefix="cc1" %>

<asp:Content ID="Head" ContentPlaceHolderID="head" runat="server">
<link rel="Stylesheet" href="/umbraco/css/backend/default.css" type="text/css" />

<script language="javascript" type="text/javascript">


</script>
</asp:Content>

<asp:Content ID="Content" ContentPlaceHolderID="body" runat="server">        
        <cc1:TabView ID="tabControl" runat="server" Height="692px" Width="552px" />
           
           <cc1:Pane ID="GeneralInfo" Height="600px" Width="330px" runat="server">
                <cc1:PropertyPanel runat="server" ID="pp_name">
                    <asp:TextBox ID="txtName" runat="server" Width="400px"></asp:TextBox>    
                </cc1:PropertyPanel>

And in the cs file

pp_name.Text = umbraco.ui.GetText("general", "name");  

But how do i set a description text that comes in within a <small><small> when rendered? I whant an explanation to what to fill in to the textbox, even tough this exampkle is straight forward =)

I tried somethink like pp_name.GroupingText but that didnt help much.

Thx for any help

Marthin