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        public static UIElement m_flyElement1 = null;
        public static UIElement m_flyElement2 = null;

...

 public static void animateSwap(string s, string t)
        {
            //m_flyElement1 = s;
            //m_flyElement1 = t

            Console.WriteLine("New Position1" + m_position1.X + ", " + m_position1.Y);
            Console.WriteLine("New Position2" + m_position2.X + ", " + m_position2.Y);

            DoubleAnimation opacityAnimation = new DoubleAnimation();
            opacityAnimation.From = 0.0;
            opacityAnimation.To = 0.7;
            opacityAnimation.AutoReverse = true;
            opacityAnimation.Duration = TimeSpan.Parse("0:0:0.25");
            opacityAnimation.DecelerationRatio = 0.3;
            Duration d = TimeSpan.Parse("0:0:0.5");

            DoubleAnimation doubleAnimation = new DoubleAnimation();
            doubleAnimation.Duration = d;
            doubleAnimation.To = m_position1.X;
            doubleAnimation.From = m_position2.X;

            DoubleAnimation doubleAnimation2 = new DoubleAnimation();
            doubleAnimation2.Duration = d;
            doubleAnimation2.To = m_position1.Y;
            doubleAnimation2.From = m_position2.Y;

            DoubleAnimation doubleAnimation3 = new DoubleAnimation();
            doubleAnimation3.Duration = d;
            doubleAnimation3.To = m_position2.X;
            doubleAnimation3.From = m_position1.X;
            DoubleAnimation doubleAnimation4 = new DoubleAnimation();
            doubleAnimation4.Duration = d;
            doubleAnimation4.To = m_position2.Y;
            doubleAnimation4.From = m_position1.Y;

            doubleAnimation.Completed += afterAnimation;

            if (m_flyElement1 == null || m_flyElement2 == null) { return; }


            m_flyElement1.BeginAnimation(Canvas.TopProperty, doubleAnimation2);
            m_flyElement1.BeginAnimation(Canvas.LeftProperty, doubleAnimation);
            m_flyElement2.BeginAnimation(Canvas.TopProperty, doubleAnimation4);
            m_flyElement2.BeginAnimation(Canvas.LeftProperty, doubleAnimation3);
            m_flyElement1.BeginAnimation(UIElement.OpacityProperty, opacityAnimation);
            m_flyElement2.BeginAnimation(UIElement.OpacityProperty, opacityAnimation);
        }

      private static void afterAnimation(object sender, EventArgs e)
        {
            resetPosition();

        }

        private void keyListener(object sender, KeyEventArgs e)
        {
            ECC.animateSwap("test", "bla");
        }