code: protected Label createTitleLabel(String id, PivotField pivotField) {
  		String title = pivotField.getTitle();
  		if (pivotField.getArea().equals(PivotField.Area.DATA)) {
  			title += " (" + pivotField.getAggregator().getFunction().toUpperCase() + ")"; 
  		}
  
  		return new Label(id, title);
  	}
docs: Retrieves a label that display the pivot table title (for fields on ROW and DATA areas)