delete lazy code in viewmodels

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

@@ -1,5 +1,4 @@
-using System;
-using GalaSoft.MvvmLight;
+using GalaSoft.MvvmLight;
 using GalaSoft.MvvmLight.Command;
 using HandyControl.Controls;
 
@@ -7,7 +6,6 @@ namespace HandyControlDemo.ViewModel
 {
     public class SplitButtonDemoViewModel : ViewModelBase
     {
-        public RelayCommand<string> SelectCmd => new Lazy<RelayCommand<string>>(() =>
-            new RelayCommand<string>(str => Growl.Info(str))).Value;
+        public RelayCommand<string> SelectCmd => new(str => Growl.Info(str));
     }
 }