HTMLEditorExtender inside Ajax Accordion

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ASP.NET

Hi!, I am having issue when trying to use the HTMLEditorExtender inside the Ajax Accordion pane. When I add HTMLEditorExtender and target a textbox that is inside the Accordion it shows me a long vertical line when I run it, however the control works fine if it is outside the Accordion.

here is my code

<cc1:Accordion Width="100%" ID="Accordion1"  runat="server" HeaderCssClass="accordionHeader" HeaderSelectedCssClass="accordionHeaderSelected"
                          ContentCssClass="accordionContent" SelectedIndex="-1" FadeTransitions="true" SuppressHeaderPostbacks="true"
                          TransitionDuration="250" FramesPerSecond="40" RequireOpenedPane="false" AutoSize="None" style="text-align:center;"
                          Height="515px">
                              <Panes>
                                  <cc1:AccordionPane ID="AccPan1"   runat="server">
                                      <Header>
                                           <table width="100%" border="0" cellspacing="2" cellpadding="2">
                                          <tr>
                                              <td style="color:#3B8DBD;text-align:left;">
                                                  Comments:
                                              </td>
                                          </tr>
                                      </table>
                                      </Header>
                                      <Content>
                                          <asp:TextBox TextMode="MultiLine" runat="server" Visible="true" Width="80%" Height="100px" ID="txtComments">
                                          </asp:TextBox>
                                          <cc1:HtmlEditorExtender  runat="server" TargetControlID="txtComments" ID="HtmlEditorExtender1">
                                          </cc1:HtmlEditorExtender>
                                          <div style="text-align:right">
                                              <asp:Button runat="server" Id="btnSaveComments" Text="Save" style="margin:5px 110px 0px 0px;" OnClick="btnSaveComments_Click"/>
                                          </div>
                                      </Content>
                                  </cc1:AccordionPane>
                              </Panes>
                          </cc1:Accordion>

Can you please assist on this one.