code: @Override
      public boolean isSet(String propName) {
          if (propName.equals("level")) {
              return isSetLevel();
          }
          if (propName.equals("treeView")) {
              return isSetTreeView();
          }
          return super.isSet(propName);
      }
docs: /*
  Returns true if the requested property is set; false, otherwise.
  
  @return
  returned object is {@link boolean }