public void GoBack(System.Windows.Controls.Frame view)
        {
            var currentContent = (UIElement)view.Content;

            if (currentContent == null)
            {
                return;
            }

            Frame.GoBack.Enabled = false;
            var fadeOutAnimation = new DoubleAnimation(0d, TimeSpan.FromSeconds(0.25));

            fadeOutAnimation.Completed += (o, e) =>
            {
                view.GoBack();
                Frame.GoBack.Enabled = true;
            };

            currentContent.BeginAnimation(UIElement.OpacityProperty, fadeOutAnimation);
        }