code: public boolean isDropEnabled() {
  
          if (m_dropEnabled != null) {
              return m_dropEnabled.booleanValue();
          }
          CmsTree<?> tree = getTree();
          if (tree == null) {
              return false;
          }
          return tree.isDropEnabled();
      }
docs: Checks if dropping is enabled.<p>
  
  @return <code>true</code> if dropping is enabled