code: public static int findVerticalOffset(JRDesignBand band) {
  		int finalHeight = 0;
  		if (band != null) {
  			for (JRChild jrChild : band.getChildren()) {
  				JRDesignElement element = (JRDesignElement) jrChild;
  				int currentHeight = element.getY() + element.getHeight();
  				if (currentHeight > finalHeight) finalHeight = currentHeight;
  			}
  			return finalHeight;
  		}
  		return finalHeight;
  	}
docs: Finds "Y" coordinate value in which more elements could be added in the band
  @param band
  @return