code: public void showSlideStep(final SlideStep slideStep) {
  
          if (this.subSlides.size() >= model().getStepPosition() || this.subSlides.get(model().getStepPosition()) == null) {
              addSubSlide(buildDefaultContent(model().getContent(slideStep)));
          }
          final Node nextSlide = this.subSlides.get(model().getStepPosition());
  
          if (this.currentSubSlide == null || nextSlide == null) {
              // No Animation
              this.currentSubSlide = nextSlide;
          } else {
              performStepAnimation(nextSlide);
          }
  
      }
docs: Show the slide step store which match with XML file.
  
  @param slideStep the slide step to show