public static void SelectClipsInSpanInTrack(TrackAsset track, double start, double end)
        {
            var selectionManager = TimelineBase.selectionManager;
            var clear            = selectionManager.GetMethod("Clear");
            var add = selectionManager.GetMethod("Add", new Type[] { typeof(TimelineClip) });

            clear.Invoke(null, null);

            foreach (var clip in ClipUtils.GetClipsInSpanInTrack(track, start, end))
            {
                add.Invoke(null, new object[] { clip });
            }

            TimelineWindowUtils.Repaint();
        }