code: public static CmsChangeHeightAnimation change(Element element, int targetHeight, Command callback, int duration) {
  
          CmsChangeHeightAnimation animation = new CmsChangeHeightAnimation(element, targetHeight, callback);
          animation.run(duration);
          return animation;
      }
docs: Slides the given element into view executing the callback afterwards.<p>
  
  @param element the element to slide in
  @param targetHeight the height when the animation should stop
  @param callback the callback executed after the animation is completed
  @param duration the animation duration
  
  @return the running animation object