Scenario with dependency properties-how to access each other
public class UC:UserControl
{
 public List<string> AvailableItems
        {
            get { return (List<string>)this.GetValue(AvailableItemsProperty); }
            set { this.SetValue(AvailableItemsProperty, value);  }
        }
        public static readonly DependencyProperty AvailableItemsProperty = DependencyProperty.Register(
          "AvailableItems", typeof(List<string>), typeof(ItemSelectionUserControl), new FrameworkPropertyMetadata(OnAvailableItemsChanged) { BindsTwoWayByDefault = true });

        public List<string> SelectedItems
        {
            get { return (List<string>)this.GetValue(SelectedItemsProperty); }
            set { this.SetValue(SelectedItemsProperty, value); }
        }
            public static readonly DependencyProperty SelectedItemsProperty = DependencyProperty.Register(
              "SelectedItems", typeof(List<string>), typeof(ItemSelectionUserControl), new FrameworkPropertyMetadata { BindsTwoWayByDefault = true });

 public static void OnAvailableItemsChanged(DependencyObject sender,  DependencyPropertyChangedEventArgs e)
        {
           //How to access SelectedItems here??
        }

    }

public static void OnAvailableItemsChanged(DependencyObject sender,  DependencyPropertyChangedEventArgs e)
        {
           UC uc = sender as UC;
           List<string> selectedItems = uc.SelectedItems;
        }