Item not showing

[scrut]

Hi
I use the RadPanelBar to display a simple menu which is fed by a sitemap datasource:

<telerik:RadPanelBar ID="RadPanelBarMenu" runat="server" DataSourceID="SiteMapDataSource" Width="200px" Font-Bold="True" Skin="Telerik">
    <CollapseAnimation Duration="100" Type="None" />
    <ExpandAnimation Duration="100" Type="None" />
</telerik:RadPanelBar>

Security trimming is enabled:

        <siteMap defaultProvider="XmlSiteMapProvider" enabled="true">
            <providers>
                <add name="XmlSiteMapProvider" description="Default SiteMap provider." type="System.Web.XmlSiteMapProvider " siteMapFile="Web.sitemap" securityTrimmingEnabled="true"/>
            </providers>
        </siteMap>
        <authentication mode="Forms">
            <forms name=".SATAUTH" loginUrl="Login.aspx" protection="All" timeout="60" path="/" slidingExpiration="true" requireSSL="false" defaultUrl="Default.aspx"/>
        </authentication>
        <authorization>
            <deny users="?"/>
            <allow users="*"/>
        </authorization>

All menu items (sitemap nodes) are accessible to anyone. Only the last one called "Administration" should be invisible unless a person with administrator privileges is using the site.

<?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" roles="*">

    <siteMapNode url="~/CaseManagement/CaseOverview.aspx" title="Data Input"  description="Case Management (Data input)" roles="*" />

    <siteMapNode url="" title="Reports" roles="*">
      <siteMapNode url="~/Reports/ProvisionsReportFilter.aspx" title="Provisions Report"  description="Provisions Report" roles="*" />
      <siteMapNode url="~/Reports/DivisionalControllingReportFilter.aspx" title="Divisional Controlling Report"  description="Divisional Controlling Report" roles="*" />
      <siteMapNode url="~/Reports/FinancialReportFilter.aspx" title="Financial Report"  description="Financial Report" roles="*" />
      <siteMapNode url="~/Reports/OverviewReportFilter.aspx" title="Overview Report" description="Overview Report" roles="*" />
      <siteMapNode url="~/Reports/PPTPreparationReportFilter.aspx" title="PPT Preparation Report" description="PPT Preparation Report" roles="*" />
    </siteMapNode>

    <siteMapNode url="" title="Info" roles="*">
      <siteMapNode url="~/Info/CorporateStructure.aspx" title="Corporate Structure"  description="Corporate Structure" roles="*" />
      <siteMapNode url="~/Info/Currencies.aspx" title="Exchange Rates"  description="Supported Currencies and Exchange Rates" roles="*" />
      <siteMapNode url="~/Info/Plants.aspx" title="Plants"  description="List of Plants" roles="*" />
      <siteMapNode url="~/Info/Supplier.aspx" title="Supplier"  description="List of Supplier" roles="*" />
    </siteMapNode>

    <siteMapNode url="" title="Administration" roles="Administrator">
      <siteMapNode url="~/Administration/UserManager.aspx" title="User Manager"  description="User Manager" roles="Administrator" />
      <siteMapNode url="~/Administration/SupplierManager.aspx" title="Supplier Manager"  description="Supplier Manager" roles="Administrator" />
      <siteMapNode url="~/Administration/FinancialClosingManager.aspx" title="Financial Closing Manager"  description="Financial Closing Manager" roles="Administrator" />
      <siteMapNode url="~/Administration/SnapshotManager.aspx" title="Snapshot Manager"  description="Snapshot Manager" roles="Administrator" />
    </siteMapNode>

  </siteMapNode>

</siteMap>

This mechanism actually does work. Except for one very annoying thing:
An Admin can actually see the Administration-menu item when he is on the default page. But once he clicks e.g. on any other item (e.g. Data Input or Report or their children), the Administration-item disappears.

Consequently, the user always has to go back to the default / home page in order to perform administrative tasks.

Any idea why the admin item disappears while using any other page?

Thanks

s.