private void OnLoaded(object sender, RoutedEventArgs e)
{
Instance = this;
Start.Visibility = Visibility.Visible;
Stop.Visibility = Visibility.Collapsed;
Retry.Visibility = Visibility.Collapsed;
Menu.Visibility = Visibility.Visible;
Progress.maximum = K.MaxReadings;
Progress.minimum = 0;
Progress.Value = 0;
Refresh();
}