docs: function(){
      return {
        bindDragNDrop: function(node, handlers){
          if (handlers)
          {
            var events = Viva.Graph.Utils.dragndrop(node.ui.element);
  
            ['onStart', 'onDrag', 'onStop'].forEach(function(name){
              if (typeof handlers[name] === 'function')
                events[name](handlers[name]);
            });
  
            node.events = events;
          }
          else if (node.events)
          { // TODO: i'm not sure if this is required in JS world...
            node.events.release();
            node.events = null;
          }
        }
      };
    }