How to content <%=Html.TextArea()%>

Code:

---


                        <ext:FormPanel ID="formcode" runat="server" >
                        <Content>
                        <%=Html.TextArea("sds") %>
                        </Content>
                        </ext:FormPanel>

---

here is my code, but show on screen is Unnormal.
please check Attachments.

thx~