public void ActivateNextVariation()
{
if (Variations == null || !Variations.Any())
{
throw new Exception("Can't activate next variation if none are defined.");
}
var activeIndex = Variations.IndexOf(ActiveVariation);
var nextIndex = activeIndex + 1;
if (nextIndex >= Variations.Count)
{
nextIndex = 0;
}
ActiveVariation = Variations[nextIndex];
}