Dear Umbraco Team

I have the following development code for creating various sub menus, to meet certain requirements.

@inherits Umbraco.Web.Mvc.UmbracoTemplatePage
@{
    var childPages = Model.Content.Children;
    var ancestors = Model.Content.Ancestors();
    var ancestorsOrSelf = Model.Content.AncestorOrSelf();
}
<ul>
    @foreach(var item in childPages)
    {
        <li><a href="@item.Url">@item.Name</a></li>
    }
</ul>
<ul>
    @foreach(var item in ancestors)
    {
        <li><a href="@item.Url">@item.Name</a></li>
    }
</ul>
<ul>
    @foreach(var item in ancestorsOrSelf)
    {
        <li><a href="@item.Url">@item.Name</a></li>
    }
</ul>

The code above give the following error for ancestorOrSelf variable:

CS1579: foreach statement cannot operate on variables of type 'Umbraco.Core.Models.IPublishedContent' because 'Umbraco.Core.Models.IPublishedContent' does not contain a public definition for 'GetEnumerator'

any reason why am i missing something simple ?

Thanks Dibs