rn d.z })
                    .useVoronoi(false);
                d3.select(graphElement).selectAll("svg")
                    .datum(randomData())
                    .transition().duration(500)
                    .call(chart);
                nv.utils.windowResize(chart.update);
                return chart;
            });

            function randomData() {
                var data = [];
                for (i = 0; i < 2; i++) {
                    data.push({
                        key: 'Group ' + i