add Notification

src/Shared/HandyControlDemo_Shared/ViewModel/Controls/NotificationDemoViewModel.cs

@@ -0,0 +1,35 @@
+#if netle40
+using GalaSoft.MvvmLight.Command;
+#else
+using GalaSoft.MvvmLight.CommandWpf;
+# endif
+using System;
+using GalaSoft.MvvmLight;
+using HandyControl.Controls;
+using HandyControl.Data;
+using HandyControlDemo.UserControl;
+
+namespace HandyControlDemo.ViewModel
+{
+    public class NotificationDemoViewModel : ViewModelBase
+    {
+        public RelayCommand OpenCmd => new Lazy<RelayCommand>(() =>
+            new RelayCommand(() => Notification.Show(new AppNotification(), ShowAnimation, StaysOpen))).Value;
+
+        private ShowAnimation _showAnimation;
+
+        public ShowAnimation ShowAnimation
+        {
+            get => _showAnimation;
+            set => Set(ref _showAnimation, value);
+        }
+
+        private bool _staysOpen = true;
+
+        public bool StaysOpen
+        {
+            get => _staysOpen;
+            set => Set(ref _staysOpen, value);
+        }
+    }
+}