private void Begin(DependencyObject targetObject, INameScope nameScope, Int64 layer)
{
if (Storyboard == null)
{
throw new InvalidOperationException(SR.Get(SRID.Storyboard_StoryboardReferenceRequired));
}
if (Name != null)
{
Storyboard.BeginCommon(targetObject, nameScope, _handoffBehavior, true /* == is controllable */, layer);
}
else
{
Storyboard.BeginCommon(targetObject, nameScope, _handoffBehavior, false /* == not controllable */, layer);
}
}