completed the branch

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

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+using System;
+using GalaSoft.MvvmLight;
+using HandyControl.Controls;
+using HandyControl.Data;
+#if netle40
+using GalaSoft.MvvmLight.Command;
+#else
+using GalaSoft.MvvmLight.CommandWpf;
+# endif
+
+namespace HandyControlDemo.ViewModel
+{
+    public class SideMenuDemoViewModel : ViewModelBase
+    {
+        public RelayCommand<FunctionEventArgs<object>> SwitchItemCmd => new Lazy<RelayCommand<FunctionEventArgs<object>>>(() =>
+            new RelayCommand<FunctionEventArgs<object>>(SwitchItem)).Value;
+
+        private void SwitchItem(FunctionEventArgs<object> info) => Growl.Info((info.Info as SideMenuItem)?.Header.ToString());
+    }
+}