code: public void destroy() {
  
          m_attributeName = null;
          m_attributeType = null;
          m_attributeValueViews.clear();
          m_attributeValueViews = null;
          m_dndHandler = null;
          m_entity = null;
          m_entityType = null;
          m_entityBackEnd = null;
          m_widgetService = null;
      }
docs: Destroys the attribute handler instance.<p>