How do I actually use a Phoenix Up?

I bought a few Phoenix Ups in anticipation that I would need one eventually. Well, in this battle, my Barbarian was killed. Because it is a major battle, I would like him to get the experience for it. Unfortunately, I can't seem to figure out how to use a Phoenix Up. It isn't present in the item list for other characters, and I can't access an item list for the Barbarian. What do I do?

Solution 1:

I eventually figured out what was happening. The item list started out scrolled to the bottom, and the Phoenix Up was at the top. In order to scroll this list, you must use your mouse wheel, and there is no scroll bar. In every other list in the game, the scroll wheel doesn't work, so I didn't even try it.