private void OnIsPaneOpenChanged(SplitView sender, AvaloniaPropertyChangedEventArgs e)
        {
            var newValue = (bool)e.NewValue;
            var oldValue = (bool)e.OldValue;

            if (sender == null ||
                newValue == oldValue)
            {
                return;
            }

            if (newValue)
            {
                sender.ChangeVisualState(); // Open pane
            }
            else
            {
                sender.OnIsPaneOpenChanged(); // Close pane
            }
        }
 private void OnMetricsChanged(SplitView sender, AvaloniaPropertyChangedEventArgs e)
 {
     sender?.TemplateSettings?.Update();
     sender?.ChangeVisualState(true, true);
 }
 private void OnStateChanged(SplitView sender, AvaloniaPropertyChangedEventArgs e)
 {
     sender?.ChangeVisualState();
 }