code: public void init(BaseField field, String targetFieldName, BaseField fldTarget)
      {
          super.init(field);
  
          m_bDisableTarget = false;
          this.targetFieldName = targetFieldName;
          m_fldTarget = fldTarget;
      }
docs: Constructor.
  @param field The basefield owner of this listener (usually null and set on setOwner()).
  @param iTargetFieldSeq The target field sequence to recompute on field change.
  @param fldTarget The target field to recompute on field change.