diff --git a/src/NotifyIconWpf.Sample.ShowCases/Tutorials/06 - Commands/ShowMessageCommand.cs b/src/NotifyIconWpf.Sample.ShowCases/Tutorials/06 - Commands/ShowMessageCommand.cs
index 7aac104..f108317 100644
--- a/src/NotifyIconWpf.Sample.ShowCases/Tutorials/06 - Commands/ShowMessageCommand.cs	
+++ b/src/NotifyIconWpf.Sample.ShowCases/Tutorials/06 - Commands/ShowMessageCommand.cs	
@@ -20,6 +20,10 @@ namespace NotifyIconWpf.Sample.ShowCases.Tutorials
             return true;
         }
 
-        public event EventHandler CanExecuteChanged;
+        public event EventHandler CanExecuteChanged
+        {
+            add => CommandManager.RequerySuggested += value;
+            remove => CommandManager.RequerySuggested -= value;
+        }
     }
 }
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