In a Windows Form, where should the Add / Remove buttons go when you have a header record with single attribute children, as below? Should the "Child Items" label be above the list box?

Update:
Trying to apply DripDrop's suggestion:

In a Windows Form, where should the Add / Remove buttons go when you have a header record with single attribute children, as below? Should the "Child Items" label be above the list box?

Update:
Trying to apply DripDrop's suggestion:

What you have is fine, and I would!dent move it. What I would suggest is that you group the list and the buttons together, so the user immediately knows that they are together.
EDIT: Yes, that looks great.