code: public CrosstabBuilder addInvisibleMeasure(String property, String className, String title) {
          DJCrosstabMeasure measure = new DJCrosstabMeasure(property, className, DJCalculation.NOTHING, title);
          measure.setVisible(false);
          crosstab.getMeasures().add(measure);
          return this;
      }
docs: Adds a measure to the crosstab. A crosstab can have many measures. DJ will lay out one measure above
  the other.
  
  A measure is what is shown on each intersection of a column and a row. A calculation is performed to
  all occurrences in the datasource where the column and row values matches (between elements)
  
  The only difference between the prior methods is that this method sets "visible" to false
  
  @param property
  @param className
  @param title
  @return