You can find a sample on http://dl.dropbox.com/u/11564619/Adverse%20events.png (the wireframe is in italian, sorry....)
As you can see I put ome or more combos in the window (there isn't the option to modify the window background color, I have to draw a panel....) and, then, on the right side I list it's content; if I have many combos, I waste a lot of space...
Of course, I could use a text paragraph, but a combo would be better, in my opinion....