Some backgrounds, including the courtroom, are "pre-defined backgrounds." You will already seem them available when you change the place of a frame in the screen editor. You don't need to do anything in the place tab.
[D]isordered speech is not so much injury to the lips that give it forth, as to the disproportion and incoherence of things in themselves, so negligently expressed. ~ Ben Jonson
Current AAO Development Priority: Issue #94: Grayscale Mode