Fixed Systray NotifyPropertyChanged, shortcut setting window

Views/DelegateCommand.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Windows.Input;
+
+namespace unison
+{
+    public class DelegateCommand : ICommand
+    {
+        public Action CommandAction { get; set; }
+        public Func<bool> CanExecuteFunc { get; set; }
+
+        public void Execute(object parameter)
+        {
+            CommandAction();
+        }
+
+        public bool CanExecute(object parameter)
+        {
+            return CanExecuteFunc == null || CanExecuteFunc();
+        }
+
+        public event EventHandler CanExecuteChanged
+        {
+            add { CommandManager.RequerySuggested += value; }
+            remove { CommandManager.RequerySuggested -= value; }
+        }
+    }
+}