public void First ()
{
CancelErrorTransition ();
Source = NextSource;
// This and OnTransition() below commented out b/c of BGO #524556
//raise_started_after_transition = true;
if (Source is IBasicPlaybackController && ((IBasicPlaybackController)Source).First ()) {
} else {
((IBasicPlaybackController)this).First ();
}
//OnTransition ();
}