code: public List<Double> getCustomTickmarkLabels() {
          java.util.List<Double> customTickmarkLabelsCopy = new java.util.ArrayList<Double>(10);
          customTickmarkLabelsCopy.addAll(customTickmarkLabels);
          //return (java.util.ArrayList<Double>) this.CUSTOM_TICKMARK_LABELS.clone();
          return customTickmarkLabelsCopy;
      }
docs: Returns a list of the defined custom tickmark labels
  e.g. you only want to show "0, 10, 50, 100" in your
  gauge scale so you could set the custom tickmarklabels
  to these values.
  @return the arraylist containing custom tickmark labels