I finished to develop an XNA game, then I created the Monogame project, and tested it on my device. Now I made some other pages such as an "about" page. How can I go to that page considering I have a Monogame project and just an XNA code? In particular inside my game I made a Main Menu where you can click the "about" button and know if someone has clicked: how can I link that event to the "go to about.xaml" function?

Inside XNA, update method:

if (about_button.IsClicked())
{
    // Go to about.xaml
}

I tried:

   if (about_button.IsClicked())
    {
         ((PhoneApplicationFrame)Application.Current.RootVisual).Navigate(new Uri("/About.xaml", UriKind.Relative));
    }

But it throws: System.UnauthorizedAccessException