code: function (nodes, applyFishEyeViewToEachNode) {
      nodes.data("expand", true); // Mark that the nodes are still to be expanded
      var roots = elementUtilities.getTopMostNodes(nodes);
      for (var i = 0; i < roots.length; i++) {
        var root = roots[i];
        this.expandTopDown(root, applyFishEyeViewToEachNode); // For each root node expand top down
      }
      return nodes;
    }
docs: /*
  A helper function to expand given nodes in a simple way (Without performing layout afterward)
  It expands all top most nodes top down.