AJAXControlToolkit HtmlEditorExtender not working with ModalPopupExtender

I'm trying to add a HtmlEditorExtender to a ModalPopupExtender, but the html editor isn't showing up correctly.  If I remove the html editor and just leave the textbox the modal popup is working fine.

I'm also using the newest Toolkit.

Here's an image of what I get as a result
Screen Shot of Result
And here's the code I'm using:
 
<asp:Panel ID="pnlModalAboutUs" runat="server" style="display:none;" CssClass="modalPopup">
        <asp:TextBox ID="tbxAboutUs" runat="server" Columns="60" Rows="8" TextMode="MultiLine" />
        <asp:HtmlEditorExtender runat="server" TargetControlID="tbxAboutUs" />
        <br />
        <asp:Button ID="btnUpdate" runat="server" Text="Update" OnClick="btnUpdate_Click" />
        <asp:Button ID="btnCancel" runat="server" Text="Cancel" />
    </asp:Panel>
    <asp:ModalPopupExtender ID="mpe1" runat="server" 
        TargetControlID="lnkbEditAbout"
        PopupControlID="pnlModalAboutUs" 
        BackgroundCssClass="modalBackground" 
        CancelControlID="btnCancel" />

<asp:LinkButton ID="lnkbEditAbout" runat="server" OnClick="lnkbEditAbout_Click" CausesValidation="false">Edit</asp:LinkButton>

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chshelpdeskAsked:
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chshelpdeskConnect With a Mentor Author Commented:
Issue fixed.  Had to remove the style="display:none;" in the panel.
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