private void InitFrames()
{
if (_initialKeyFrame == null)
{
_initialKeyFrame = new KeyFrame <TValue>
{
Value = (TValue)Target.GetValue(TargetProperty),
KeyTime = 0
};
}
_sortedKeyFrames = KeyFrames.OrderBy(x => x.KeyTime).ToList();
_sortedKeyFrames.Insert(0, _initialKeyFrame);
Duration = (uint)_sortedKeyFrames.Last().KeyTime;
}