code: public boolean isNoneDisplay(final TargetMode _mode)
      {
          boolean ret = false;
          if (this.mode2display.containsKey(_mode)) {
              ret = this.mode2display.get(_mode).equals(Field.Display.NONE);
          } else if (_mode.equals(TargetMode.CREATE) || _mode.equals(TargetMode.SEARCH)) {
              ret = true;
          }
          return ret;
      }
docs: Is this field not displayed in the given target mode. If not explicitly
  set in the definition following defaults apply:
  <ul>
  <li>ModeConnect: false</li>
  <li>ModeCreate: true</li>
  <li>ModeView: false</li>
  <li>ModeEdit: false</li>
  <li>ModeSearch: true</li>
  <li>ModePrint: false</li>
  </ul>
  
  @param _mode target mode
  @return true if editable in the given mode, else false