completed the branch

src/Shared/HandyControl_Shared/Controls/Tag/TagContainer.cs

@@ -1,10 +1,51 @@
-using System.Windows;
+using System.Collections;
+using System.Windows;
 using System.Windows.Controls;
+using HandyControl.Tools.Extension;
 
 namespace HandyControl.Controls
 {
     public class TagContainer : ItemsControl
     {
+        public TagContainer()
+        {
+            AddHandler(Controls.Tag.ClosedEvent, new RoutedEventHandler(Tag_OnClosed));
+        }
+
+        private void Tag_OnClosed(object sender, RoutedEventArgs e)
+        {
+            if (e.OriginalSource is Tag tag)
+            {
+                tag.Hide();
+
+                if (ItemsSource == null)
+                {
+                    Items.Remove(tag);
+                }
+                else
+                {
+                    var item = ItemContainerGenerator.ItemFromContainer(tag);
+                    GetActualList()?.Remove(item);
+                    Items.Refresh();
+                }
+            }
+        }
+
+        internal IList GetActualList()
+        {
+            IList list;
+            if (ItemsSource != null)
+            {
+                list = ItemsSource as IList;
+            }
+            else
+            {
+                list = Items;
+            }
+
+            return list;
+        }
+
         protected override DependencyObject GetContainerForItemOverride() => new Tag();
 
         protected override bool IsItemItsOwnContainerOverride(object item) => item is Tag;