code: function(elem) {
      var that = this, nodeAW = elem._angularWidth, sumAW = 0;
      elem.eachSubnode(function(child) {
        that.setSubtreeAngularWidth(child);
        sumAW += child._treeAngularWidth;
      }, "ignore");
      elem._treeAngularWidth = Math.max(nodeAW, sumAW);
    }
docs: /*
  Method: setSubtreeAngularWidth
  
  Sets the angular width for a subtree.