code: public void clear() {
          itemBox.setValue("");
          label.removeStyleName(CssName.ACTIVE);
  
          Collection<Widget> values = suggestionMap.values();
          for (Widget widget : values) {
              Widget parent = widget.getParent();
              if (parent instanceof ListItem) {
                  parent.removeFromParent();
              }
          }
          suggestionMap.clear();
  
          clearStatusText();
      }
docs: Clear the chip items on the autocomplete box