internal void Status1Changed(Status status, TransferItem transferItem) { if (status == Status.Checked) { List1Checked.Add(transferItem); } else { List1Checked.Remove(transferItem); } if (List1.All(List1Checked.Contains)) { list1Status = Status.Checked; } else if (List1Checked.Count > 0) { list1Status = Status.Indeterminate; } else { list1Status = Status.UnChecked; } RequireRender = true; }