code: public CmsDNDHandler getDNDHandler() {
  
          if (m_dndHandler == null) {
              m_dndHandler = new CmsDNDHandler(new CmsAttributeDNDController());
              m_dndHandler.setOrientation(Orientation.VERTICAL);
              m_dndHandler.setScrollEnabled(true);
              m_dndHandler.setScrollElement(m_scrollElement);
          }
          return m_dndHandler;
      }
docs: Returns the drag and drop handler.<p>
  
  @return the drag and drop handler