水平菜单垂直显示cssfriendly适配器

我使用的是cssfriendly最新版本，但在应用Orientation="Horizontal"时，我的手册以Verticle格式显示。

下面是我的.ASPX代码

<asp:Menu ID="Menu1" runat="server" DataSourceID="SiteMapDataSource1" CssSelectorClass="PrettyMenu" StaticDisplayLevels="2" Orientation="Horizontal" />

站点地图代码

    <?xml version="1.0" encoding="utf-8" ?>
<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" >
  <siteMapNode url="default.aspx" title="Home"  description="Home page for site">
    <siteMapNode url="about/default.aspx" title="About"  description="About Us" />
    <siteMapNode url="help/default.aspx" title="Help"  description="FAQs and SiteMap">
      <siteMapNode url="help/faq.aspx" title="FAQ"  description="Frequently Asked Questions" />
      <siteMapNode url="help/sitemap.aspx" title="Sitemap"  description="Map of Site" />
    </siteMapNode>
  </siteMapNode>
</siteMap>

请让我提出解决这个问题的办法。

   <?xml version="1.0" encoding="utf-8" ?>
<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" >
  <siteMapNode url="default.aspx" title="Home"  description="Home page for site">
    <siteMapNode url="help/default.aspx" title="Help"  description="FAQs and SiteMap">
      <siteMapNode url="help/faq.aspx" title="FAQ"  description="Frequently Asked Questions" />
      <siteMapNode url="help/sitemap.aspx" title="Sitemap"  description="Map of Site" />
    </siteMapNode>
  </siteMapNode>
    <siteMapNode url="about/default.aspx" title="About"  description="About Us" />
</siteMap>