WPF: How to make a base class' dependency property read-only_

Answer 1

How about this:

namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
    }

    public class NavigableViewport3D : Viewport3D
    {
        public static readonly new DependencyProperty CameraProperty;

        static NavigableViewport3D()
        {
            NavigableViewport3D.CameraProperty = Viewport3D.CameraProperty.AddOwner( typeof( NavigableViewport3D ) );
        }
    }
}