title: How correct set PropertyPath
body: <p>How correct add PropertyPath ?</p>
  
  <p>I need binding usercontrol DataContext to DataContext, TwoWay.</p>
  
  <pre><code>    var binding = new Binding()
                            {
                                Mode = BindingMode.TwoWay,
                                Source = ((FrameworkElement)sender),
                                Path = new PropertyPath(FrameworkElement.DataContextProperty)
                            };
      binding.Source = ((FrameworkElement) sender);
      changeImage.SetBinding(FrameworkElement.DataContextProperty, binding);
  </code></pre>