code: public void init(BaseField field, BaseField fldDest, String stringValue, Converter convCheckMark)
      {
          super.init(field, fldDest, stringValue, convCheckMark);
      }
docs: Constructor.
  @param field The basefield owner of this listener (usually null and set on setOwner()).
  @param fldDest The destination field.
  @param stringValue The string to set the destination field to.
  @param convconvCheckMark If this evaluates to false, don't do the move.