protected override void OnOpened() { ChartData = new TweakedObservableCollection <ChartDataDto>(new[] { new ChartDataDto { Area = "East", TotalSales = 10000 }, new ChartDataDto { Area = "West", TotalSales = 20000 }, new ChartDataDto { Area = "North", TotalSales = 12500 }, new ChartDataDto { Area = "South", TotalSales = 7500 } }); }