<TreeView  x:Name="treeview1"  SelectedItemChanged="treeview1_SelectedItemChanged" Background="{x:Null}" />

#region 属性依赖

public static readonly DependencyProperty ItemsSourceProperty =
            DependencyProperty.Register("ItemsSource", typeof(IEnumerable), 
            typeof(UCTreeView),
            new PropertyMetadata(null,new PropertyChangedCallback(OnItemsSourceChanged)));
          
        public IEnumerable ItemsSource
        {
            get { return (IEnumerable)GetValue(ItemsSourceProperty); }

set { SetValue(ItemsSourceProperty, value); }
        }

static void OnItemsSourceChanged(object sender, DependencyPropertyChangedEventArgs args)
        {
            if (sender != null && sender is UCTreeView)
            {
                UCTreeView source = (UCTreeView)sender;
                source.treeview1.ItemsSource = (IEnumerable)args.NewValue;
            }
             
        }
        #endregion

#region 事件路由

public static readonly RoutedEvent SelectedItemChangedEvent =
            EventManager.RegisterRoutedEvent("SelectedItemChanged", RoutingStrategy.Bubble, typeof(RoutedPropertyChangedEventHandler<object>), typeof(UCTreeView));

[Description("选择项改变后发生")]
        public event RoutedPropertyChangedEventHandler<object> SelectedItemChanged
        {
            add
            {
                this.AddHandler(SelectedItemChangedEvent, value);
            }

remove
            {
                this.RemoveHandler(SelectedItemChangedEvent, value);
            }
        }

public void OnSelectedItemChanged(object oldValue, object newValue)
        {
            RoutedPropertyChangedEventArgs<object> arg =
                new RoutedPropertyChangedEventArgs<object>(oldValue, newValue, SelectedItemChangedEvent); 
            this.RaiseEvent(arg); 
        }

private void treeview1_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
        {
               OnSelectedItemChanged((object)e.OldValue, (object)e.NewValue);

}

#endregion