how to make accordion pane with Collapse and Expand text

<asp:Accordion ID="MyAccordion" runat="server" HeaderCssClass="accordionHeader"
            ContentCssClass="accordionContent" FramesPerSecond="40" TransitionDuration="250"
            AutoSize="None" SelectedIndex="1" RequireOpenedPane="false"
        SuppressHeaderPostbacks="false" Width="100%" ><Panes><asp:AccordionPane ID="AccordionPane1" runat="server"><Header><asp:HyperLink ID="HyperLink1" runat="server">Panel1</asp:HyperLink></Header><Content><asp:Panel ID="Panel1" runat="server" Width="0px"><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /></asp:Panel></Content></asp:AccordionPane></Panes></asp:Accordion>

can i set Collapse and Expand text by using accordion text?