animate

public void animateCover()
        {
            CoverLeft.Margin = new Thickness(0, 0, 0, 0);
            CoverRight.Margin = new Thickness(0, 0, 0, 0);

            DispatcherTimer uiTimer = new DispatcherTimer();
            uiTimer.Tick += new EventHandler(moveCoverSides);
            uiTimer.Interval = new TimeSpan(0, 0, 0, 0, 1000 / 60);
            uiTimer.Start();

        }

        private void moveCoverSides(object sender, EventArgs e)
        {
            double currentTop = CoverLeft.Margin.Top;

            CoverLeft.Margin = new Thickness(0, currentTop-50, 0, -currentTop + 50);

            double currentTopRight = CoverRight.Margin.Bottom;

            CoverRight.Margin = new Thickness(0, -currentTopRight + 50, 0, currentTopRight - 50);

        }