AttachedCommandBehavior.CommandBehavior.OnEventChanged C# (CSharp) Method

        private static void OnEventChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            CommandBehaviorBinding binding = FetchOrCreateBinding(d);
            //check if the Event is set. If yes we need to rebind the Command to the new event and unregister the old one
            if (binding.Event != null && binding.Owner != null) {
                binding.Dispose();
            }
            //bind the new event to the command
            binding.BindEvent(d, e.NewValue.ToString());
        }