添加项目文件。

Dragablz/Dragablz/HeaderedItemViewModel.cs

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+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+
+namespace Dragablz
+{
+    /// <summary>
+    /// Helper class to create view models, particularly for tool/MDI windows.
+    /// </summary>
+    public class HeaderedItemViewModel : INotifyPropertyChanged
+    {
+        private bool _isSelected;
+        private object _header;
+        private object _content;
+
+        public HeaderedItemViewModel()
+        {
+        }
+
+        public HeaderedItemViewModel(object header, object content, bool isSelected = false)
+        {
+            _header = header;
+            _content = content;
+            _isSelected = isSelected;
+        }
+
+        public object Header
+        {
+            get { return _header; }
+            set
+            {
+                if (_header == value) return;
+                _header = value;
+#if NET40
+                OnPropertyChanged("Header");
+#else
+                OnPropertyChanged();
+#endif
+            }
+        }
+
+        public object Content
+        {
+            get { return _content; }
+            set
+            {
+                if (_content == value) return;
+                _content = value;
+#if NET40
+                OnPropertyChanged("Content");
+#else
+                OnPropertyChanged();
+#endif
+            }
+        }
+
+        public bool IsSelected
+        {
+            get { return _isSelected; }
+            set
+            {
+                if (_isSelected == value) return;
+                _isSelected = value;
+#if NET40
+                OnPropertyChanged("IsSelected");
+#else
+                OnPropertyChanged();
+#endif
+            }
+        }
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+#if NET40
+        protected virtual void OnPropertyChanged(string propertyName)
+#else
+        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
+#endif
+        {
+            var handler = PropertyChanged;
+            if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+}