WinUI KeyboardAccelerator workaround

KeyboardAcceleratorWorkaround.cs

public static class KeyboardAcceleratorWorkaround
{
    public static void CreateShadowAccelerators(this MenuBar menuBar, UIElement target)
    {
        foreach (var menu in menuBar.Items)
        {
            ProcessItems(menu.Items, target);
        }
    }

    private static void ProcessItems(IList<MenuFlyoutItemBase> items, UIElement target)
    {
        foreach (var item in items)
        {
            if (item is MenuFlyoutSubItem i)
            {
                ProcessItems(i.Items, target);
            }
            else if (item is MenuFlyoutItem fi)
            {
                ProcessItem(fi, target);
            }
        }
    }

    private static void ProcessItem(MenuFlyoutItem fi, UIElement target)
    {
        foreach (var accel in fi.KeyboardAccelerators)
        {
            var shadowAccel = new KeyboardAccelerator
            {
                Modifiers = accel.Modifiers,
                Key = accel.Key
            };

            shadowAccel.Invoked += (s, e) =>
            {
                if (fi.Command.CanExecute(fi.CommandParameter))
                {
                    fi.Command.Execute(fi.CommandParameter);
                }

                e.Handled = true;
            };

            target.KeyboardAccelerators.Add(shadowAccel);
        }
    }
}

Thanks for sharing!