Hi Ralph,
I have found that ?Return to back? is more successful if I use it, then deselect the box, and save the specification.
However, for those instances when even this does not appear to be working, I have another solution. I lasso the Box and the field that is inside it. Then, using the shift-key, I deselect the box.
If you have not lassoed in the specification editor, you do this by holding down the left mouse and then dragging over the items that you want selected.