Inheritance: DoubleAnimationUsingKeyFrames
        void BeginDropAnimation(WorkflowViewElement target)
        {
            DropAnimation opacityAnimation = new DropAnimation();

            target.BeginAnimation(FrameworkElement.OpacityProperty, opacityAnimation);
        }
 void BeginDropAnimation(WorkflowViewElement target)
 {
     DropAnimation opacityAnimation = new DropAnimation();
     target.BeginAnimation(FrameworkElement.OpacityProperty, opacityAnimation);
 }