public void CanAddElement()
{
var chart = new Chart();
var ds = new ChartDataset();
var tt = new ChartSet();
var tl = new ChartTrendLine();
var tl2 = new ChartTrendLine();
var tls = new ChartTrendLines();
tl2.SetParentElement(tls);
tt.SetParentElement(ds);
chart.Add(ds).Add(tt).Add(tl).Add(tl2);
Assert.AreEqual(1, chart.Datasets.Children.Count);
Assert.AreEqual(1, chart.Datasets.Children.First().Children.Count);
Assert.AreEqual(1, chart.TrendLines.Children.Count);
}