private void Slider_PointerPressed(object sender, PointerRoutedEventArgs e)
{
startPosition = e.GetCurrentPoint(Base).Position;
startPosition.X -= sliderPosition.X;
startPosition.Y -= sliderPosition.Y;
Captured?.Invoke(this, EventArgs.Empty);
pointerCaptured = Slider.CapturePointer(e.Pointer);
}