docs: private int findYOffsetForGroupLabel(JRDesignBand band) {
  		int offset = 0;
  		for (JRChild jrChild : band.getChildren()) {
  			JRDesignElement elem = (JRDesignElement) jrChild;
  			if (elem.getKey() != null && elem.getKey().startsWith("variable_for_column_")) {
  				offset = elem.getY();
  				break;
  			}
  		}
  		return offset;
  	}