/**
  * add a Conditional Formatting rule. Excel allows to create up to 3 Conditional Formatting rules.
  *
  * @param cfRule - Conditional Formatting rule
  */
 public void addRule(HSSFConditionalFormattingRule cfRule) {
   cfAggregate.addRule(cfRule.getCfRuleRecord());
 }
 /**
  * Replaces an existing Conditional Formatting rule at position idx. Excel allows to create up to
  * 3 Conditional Formatting rules. This method can be useful to modify existing Conditional
  * Formatting rules.
  *
  * @param idx position of the rule. Should be between 0 and 2.
  * @param cfRule - Conditional Formatting rule
  */
 public void setRule(int idx, HSSFConditionalFormattingRule cfRule) {
   cfAggregate.setRule(idx, cfRule.getCfRuleRecord());
 }