添加项目文件。

Dragablz/DragablzDemo/CustomHeaderViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+using DragablzDemo.Annotations;
+
+namespace DragablzDemo
+{
+    public class CustomHeaderViewModel : INotifyPropertyChanged
+    {
+        private string _header;
+        private bool _isSelected;
+
+        public string Header
+        {
+            get { return _header; }
+            set
+            {
+                if (value == _header) return;
+                _header = value;
+#if NET40
+                OnPropertyChanged("Header");
+#else
+                OnPropertyChanged();
+#endif                
+            }
+        }
+
+        public bool IsSelected
+        {
+            get { return _isSelected; }
+            set
+            {
+                if (value.Equals(_isSelected)) return;
+                _isSelected = value;
+#if NET40
+                OnPropertyChanged("IsSelected");
+#else
+                OnPropertyChanged();
+#endif                
+            }
+        }
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        [NotifyPropertyChangedInvocator]
+#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));
+        }
+    }
+}