PgAdmin III -- how to merge output pane and query pane

Somehow, I clicked on something the wrong way and popped the output pane out into a separate window from the query pane. I've tried restarting my computer, restarting PgAdmin III, but nothing fixes it. It's really annoying, and very hard to work with if I have more than one query window open. Hopefully the image shows what I'm talking about. What can I do to pop the output pane back into the bottom of the query pane?