public void AddTruthRect(int start, int end, Brush color, double height = 1) { RectangleHighlight rec = new RectangleHighlight(); rec.Bounds = new System.Windows.Rect(start, 0, end - start, height); rec.Fill = color; rec.Opacity = 0.5; _rectList.Add(rec); // _chartPlotter.Children.Add(rec); }