private async void LessonContainer_StylusDown(object sender, StylusDownEventArgs e) { // If touch-and-hold (within 9px radius circle, over 700ms) if (await TouchHelper.StylusHold(e, LessonContainer, 700, 9)) { // Opens RadialMenu layerStack.OpenRadialMenu(layerStack.Viewport.GetViewport(), e.GetPosition(LessonContainer), RadialMenuState.Levels.Main); } }