custom html editor issue

Hello. I have a webpage with a tabcontainer on it. One of the tab panels
holds just the notes for the record (aspx info).

I did up a custom editor to put on the tab panel. The custom editor works
and looks fine on its own in combination with the css (stylesheet info and
html info).

==== aspx info
<cc1:TabPanel ID="tabNotes" runat="server" HeaderText="Notes">
<ContentTemplate>
<asp:Textbox ID="ChangeRequestNotesLabel" runat="server"
Text='<%# Eval("ChangeRequestNotes") %>'
Height="350px"
Width="975px"
TextMode="MultiLine" />
</ContentTemplate>
</cc1:TabPanel>

==== stylesheet info
..CustomDetailNotesEditor .ajax__htmleditor_editor_toptoolbar
{
background-color: Aqua;
padding: 2px 2px 2px 2px;
}

..CustomDetailNotesEditor .ajax__htmleditor_editor_container
{
font-size: 12px;
padding: 5px 5px 5px 5px;
margin: 0px;
border-style: solid;
background-color: #ffffff;
border-color: Blue;
}

==== html info
<custom:CustomEditor ID="cedDetailNotes" runat="server"
CssClass="CustomDetailNotesEditor" Height="350px" />

What my issue is how do it combine the two together (which I tried
unsuccessfully) on the tab panel so the notes show inside the editor?

Thanks... John