private void RefreshSnapshots()
{
SnapshotTimeline.Items = Instance.Snapshots;
SnapshotTimeline.Invalidate();
DiffSelection.Enabled = SnapshotTimeline.HasSelection &&
(SnapshotTimeline.Selection.First != SnapshotTimeline.Selection.Second);
ViewSelection.Enabled = SnapshotTimeline.HasSelection &&
(SnapshotTimeline.Selection.First == SnapshotTimeline.Selection.Second);
}