docs: public void addListeners()
      {
          super.addListeners();
          
          this.getField(Person.NAME).removeListener(this.getField(Person.NAME).getListener(CopyLastHandler.class), true);    // Only if dest is null (ie., company name is null)
          this.getField(Person.NAME).addListener(new CopyFieldHandler(this.getField(Person.NAME_SORT)));
          this.getField(Company.NAME_SORT).addListener(new CheckForTheHandler(null));
          
          CopyLastHandler listener = new CopyLastHandler(this.getField(Company.NAME_SORT));
          this.getField(Company.CONTACT).addListener(listener);    // Only if dest is null (ie., company name is null)
          listener.setOnlyIfDestNull(true);
      }