private void OnItemDragged(ItemViewModel item)
 {
     Debug.WriteLine($"OnItemDragged: {item?.Title}");
     Items.ForEach(i => i.IsBeingDragged = item == i);
 }
 private void OnItemDragLeave(ItemViewModel item)
 {
     Debug.WriteLine($"OnItemDragLeave: {item?.Title}");
     Items.ForEach(i => i.IsBeingDraggedOver = false);
 }