public static void OnPointerReleased(UIElement sender, TouchSliderC slider, PointerRoutedEventArgs e)
{
sender.ReleasePointerCapture(e.Pointer);
_isDragActive = false;
if (_lastPoint != null &&
(_lastPoint.Position.X < 0 || _lastPoint.Position.Y < 0 || _lastPoint.Position.X > slider._trackBackground.ActualWidth || _lastPoint.Position.Y > slider._trackBackground.ActualHeight))
slider.RaiseOnPointerExited(e);
e.Handled = true;
}