优化更新代码，添加界面功能并整合

WPFluent/Controls/TreeView/TreeView.xaml.cs

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+// Copyright 2003-2024 by Autodesk, Inc.
+// 
+// Permission to use, copy, modify, and distribute this software in
+// object code form for any purpose and without fee is hereby granted,
+// provided that the above copyright notice appears in all copies and
+// that both that copyright notice and the limited warranty and
+// restricted rights notice below appear in all supporting
+// documentation.
+// 
+// AUTODESK PROVIDES THIS PROGRAM "AS IS" AND WITH ALL FAULTS.
+// AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
+// MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE.  AUTODESK, INC.
+// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
+// UNINTERRUPTED OR ERROR FREE.
+// 
+// Use, duplication, or disclosure by the U.S. Government is subject to
+// restrictions set forth in FAR 52.227-19 (Commercial Computer
+// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
+// (Rights in Technical Data and Computer Software), as applicable.
+
+using System.Collections;
+using System.Diagnostics.CodeAnalysis;
+
+// ReSharper disable once CheckNamespace
+namespace WPFluent.Controls;
+
+public class TreeView : System.Windows.Controls.TreeView
+{
+    public event EventHandler<IEnumerable>? ItemsSourceChanged;
+
+    [SuppressMessage("ReSharper", "PossibleMultipleEnumeration")]
+    protected override void OnItemsSourceChanged(IEnumerable oldValue, IEnumerable newValue)
+    {
+        base.OnItemsSourceChanged(oldValue, newValue);
+        ItemsSourceChanged?.Invoke(this, newValue);
+    }
+}