spline controller is frustrating

[hawken]

I just want to assign a spline and make it play. Why is it so complicated to make it work?

Code:

splineController.Spline = myspline;
splineController.Refresh();
splineController.Position = 0;
splineController.Speed = 1;
while (!splineController.IsInitialized)
{
yield return null;
}
splineController.Play();

NOTHING HAPPENS

how is it done?