添加项目文件。

Dragablz/DragablzDemo/SimpleViewModel.cs

@@ -0,0 +1,44 @@
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using System.Runtime.Serialization.Formatters;
+using DragablzDemo.Annotations;
+
+namespace DragablzDemo
+{
+    public class SimpleViewModel : INotifyPropertyChanged
+    {
+        private bool _isSelected;
+        
+        public string Name { get; set; }
+
+        public object SimpleContent { get; set; }
+
+        public bool IsSelected
+        {
+            get { return _isSelected; }
+            set
+            {
+                if (_isSelected == value) 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));
+        }
+    }
+}