Created Issue: "PopupDiv" visible when you set HtmlEditorExtender Disable [27178]

Issue occurs when you set "Enable = False" on HtmlEditorExtender.
Tested in IE8 with and without Compability View.
See the attached file.

Code:

<div>
<asp:TextBox ID="txtObs" runat="server" TextMode="MultiLine" Width="100%" Height="70px"></asp:TextBox>
<ajax:HtmlEditorExtender ID="txtObsHtmlEditorExtender" runat="server"
Enabled="false" ClientIDMode="Static" TargetControlID="txtObs">
</ajax:HtmlEditorExtender>
</div>