Show/Hide custom menu items as based on Roles/Web.sitemap file

I have a custom menu, which leverages the standard asp.net sitemap. It works well but some of my pages are dynamically generated by URL rewriter, so they don't sit in the sitemap XML file. At the moment I rolled a custom solution which shows/hides menu items via CSS class and a programmatic check of the role that the user is in. It works ok until I visit a dynamic page that doesn't exist in the sitemap file. I've tried the "roles开发者_如何学JAVA" attribute in the sitemap file with security trimming but it isn't working because I have a custom menu.

Is there a way I could leverage the roles attribute in the sitemap file to show/hide menu items for my custom control below, even when some pages are not in the sitemap? My menu control is below...

<div class="menu">
<ul>
    <asp:Repeater ID="rpt" runat="server" DataSourceID="smdsMenuPrimary" 
        EnableViewState="False">
        <ItemTemplate>                
            <li class="<%#GetDisplayClass((SiteMapNode)Container.DataItem)%>"><a href='<%# ((SiteMapNode)Container.DataItem).Url %>'><%# ((SiteMapNode)Container.DataItem).Title %></a></li>                
        </ItemTemplate>
    </asp:Repeater>
</ul>

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You can use UrlAuthorizationModule.CheckUrlAccessForPrincipal(path) to test each URL from the site map - this method returns true if user has access to the path (file or folder) and false otherwise.