In this topic you will add some content to a Panel control which will later become expanding text.

1. In your Web application, add a standard Panel control to the main content of  your page.
2. Add some content for the expanding panel and header. For example:

<asp:Panel ID="Panel1" runat="server">

         <h3>Header</h3>

         <div>

               Vestibulum ut eros non enim commodo hendrerit. Donec porttitor tellus non magna.

               Nam ligula elit, pretium et, rutrum non, hendrerit id, ante. Nunc mauris sapien, cursus in.

         </div>

</asp:Panel>

In the next step, you will add a C1ExpanderExtender to the page.