private void AnimateTabOpening_Opacity()
{
var animation = new DoubleAnimation();
animation.From = 0;
animation.To = 1;
animation.Duration = new Duration(TimeSpan.FromMilliseconds(TAB_OPENING_OPACITY_ANIMATION_TIME));
animation.Completed += Animation_Completed;
var ease = new CubicEase();
ease.EasingMode = EasingMode.EaseIn;
animation.EasingFunction = ease;
root.BeginAnimation(OpacityProperty, animation);
}