private void HandleLoaded(object sender, RoutedEventArgs e)
{
const double offset = Math.PI;
const double step = Math.PI * 2 / 8.0;
SetPosition(C0, offset, 0.0, step);
SetPosition(C1, offset, 1.0, step);
SetPosition(C2, offset, 2.0, step);
SetPosition(C3, offset, 3.0, step);
SetPosition(C4, offset, 4.0, step);
SetPosition(C5, offset, 5.0, step);
SetPosition(C6, offset, 6.0, step);
SetPosition(C7, offset, 7.0, step);
}