Silverlight - How to navigate from a User Control to a normal page?

Question

If I do this inside a User Control:

NavigationService.Navigate(new Uri(\"/Alliance.xaml\", UriKind.Relative));

it says this error:

Answer 1

        if(Application.Current.RootVisual is Page)
        {
            ((Page) (Application.Current.RootVisual)).NavigationService.Navigate(uri);
        }

Answer 2

((Frame)(Application.Current.RootVisual as MainPage).FindName("ContentFrame"))
    .Navigate(new Uri("Page Name", UriKind.Relative));