private void OnButtonScrollClicked(object sender, ClickedEventArgs args) { if (MeasurementStarted == true) { return; } MeasurementStarted = true; Scroller.ScrollToIndex(999); FPSCounter.Reset(); AppWindow.RemoveFrameUpdateCallback(FPSCounter); AppWindow.AddFrameUpdateCallback(FPSCounter); FPSLabel.Text = "Measuring scrolling FPS..."; Scroller.ScrollAnimationEnded += OnScrollAnimaionEnded; }