Toggling with an IEnumerator and yield.

Instead of using a state variable to jog around and check what is the state of a window, why not just use an infinite collection?

public partial class Admin : Window
    {
        private IEnumerator _toggler;

        public Admin()
        {
            InitializeComponent();
            _toggler = Toggler().GetEnumerator();
        }

        public void Toggle()
        {
            _toggler.MoveNext();
        }

        private IEnumerable Toggler()
        {
            while (true)
            {
                Show();
                yield return new object();
                Hide();
                yield return new object();
            }
        }
    }

I wonder if this is a good pattern, or just me being "clever".