private void AnimateTabPageOpen()
{
var animation = new DoubleAnimation();
animation.From = 0;
animation.To = 1;
animation.Duration = new Duration(TimeSpan.FromMilliseconds(TAB_PAGE_OPEN_ANIMATION_TIME));
var ease = new CubicEase();
ease.EasingMode = EasingMode.EaseIn;
animation.EasingFunction = ease;
CurrentPage_CONTENT.BeginAnimation(OpacityProperty, animation);
}
private void AnimateTabPageClose()
{
var animation = new DoubleAnimation();
animation.From = 1;
animation.To = 0;
animation.Completed += AnimateTabPageClose_Completed;
animation.Duration = new Duration(TimeSpan.FromMilliseconds(TAB_PAGE_CLOSE_ANIMATION_TIME));
var ease = new CubicEase();
ease.EasingMode = EasingMode.EaseOut;
animation.EasingFunction = ease;
CurrentPage_CONTENT.BeginAnimation(OpacityProperty, animation);
}