port from perforce

aiwaz/Aiwaz.Editor/ViewModels/ViewModelBase.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.ComponentModel;
+
+namespace Aiwaz.Editor.ViewModels
+{
+    public class ViewModelBase : INotifyPropertyChanged
+    {
+        #region INotifyPropertyChanged Members
+
+        protected virtual void OnPropertyChanged(string propertyName)
+        {
+            if (PropertyChanged != null)
+                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
+        }
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        #endregion
+    }
+}