code: public RegionPageSectionBuilder region(final PageSectionContent.Region region) {
  		switch (region) {
  		case LEFT: // Use left region
  			this.curRegionBox = this.leftRegionBox;
  			break;
  		case CENTER: // Use center region
  			this.curRegionBox = this.centerRegionBox;
  			break;
  		case RIGHT: // Use right region
  			this.curRegionBox = this.rightRegionBox;
  			break;
  		default: // Invalid footerRegionValue, use center region as default
  			throw new IllegalStateException();
  		}
  		return this;
  	}
docs: Switch to a new region
  @param region the region that will be set
  @return this for fluent style