code: @Override
      public boolean previousStep() {
          initStepPosition();
          final boolean res = this.stepPosition.get() > 0;
          if (res && view().isReadyForSlidesStepUpdate(true)) {
  
              setCurrentFlow(SlideFlow.backward);
  
              // Launch the previous step
              showSlideStep(getStepList().get(this.stepPosition.decrementAndGet()));
          }
          // otherwise no more step return true to go to the previous slide
          return !res;
      }
docs: {@inheritDoc}