code: public final BuilderType setScrollableArea(@Nullable final Area top,
                                                 @Nullable final Area bottom) {
          getProduct().setScrollableArea(top, bottom);
          return self();
      }
docs: Sets the areas of the dialog, which is created by the builder, which should be scrollable.
  
  @param top
  The top-most area, which should be scrollable, as a value of the enum {@link Area} or
  null, if no area should be scrollable
  @param bottom
  The bottom-most area, which should be scrollable, as a value of the enum {@link
  Area}. If the top-most area is null, the bottom-most are must be null as well. The
  index of the bottom-most area must be at least the index of the top-most area
  @return The builder, the method has been called upon, as an instance of the generic type
  BuilderType