Ballz.Menu.Composite.SelectPrevious C# (CSharp) Method

        public void SelectPrevious()
        {
            if (members.All(m => !m.Selectable))
                return;
            do
            {
                index = (index + members.Count - 1) % members.Count;
            }
            while (SelectedItem == null || !SelectedItem.Selectable);
        }