add Recommendation

src/Shared/HandyControlDemo_Shared/ViewModel/Main/NoUserViewModel.cs

@@ -0,0 +1,22 @@
+using System;
+using GalaSoft.MvvmLight;
+using GalaSoft.MvvmLight.CommandWpf;
+using GalaSoft.MvvmLight.Messaging;
+using HandyControlDemo.Data;
+using HandyControlDemo.Tools;
+
+namespace HandyControlDemo.ViewModel
+{
+    public class NoUserViewModel : ViewModelBase
+    {
+        public RelayCommand<string> OpenViewCmd => new Lazy<RelayCommand<string>>(() =>
+            new RelayCommand<string>(OpenView)).Value;
+
+        private void OpenView(string viewName)
+        {
+            Messenger.Default.Send<object>(null, MessageToken.ClearLeftSelected);
+            Messenger.Default.Send(true, MessageToken.FullSwitch);
+            Messenger.Default.Send(AssemblyHelper.CreateInternalInstance($"UserControl.{viewName}"), MessageToken.LoadShowContent);
+        }
+    }
+}