docs: function(property) {
      var prop = $.splat(property || [ 'current', 'start', 'end' ]);
      NodeDim.compute(this.graph, prop, this.config);
      this.graph.computeLevels(this.root, 0, "ignore");
      var lengthFunc = this.createLevelDistanceFunc(); 
      this.computeAngularWidths(prop);
      this.computePositions(prop, lengthFunc);
    }