public LineVM() { DollarFormatter = (dollars) => dollars.ToString("C"); SecondLookupFormatter = (index) => Seconds.ElementAt((int)index).ToString(); Seconds = new List <double> { // Demonstrate the lookup values for the x-axis, one per index 10, 25, 300, 450 }; // Add actual values, one per index Sales = new ChartValues <double>(); Sales.Add(0); Sales.Add(100); Sales.Add(400); Sales.Add(1000); }