I believe the image canvas will only wrap text at non-word characters (e.g., space, hyphen, carriage return, etc.), so you'll probably need to add spaces into the string to get it to wrap, or implement your own wrapping.
My Channels: http://roku.permanence.com - Twitter: @TheEndlessDev
Instant Watch Browser (NetflixIWB), Aquarium Screensaver (AQUARIUM), Clever Clocks Screensaver (CLEVERCLOCKS), iTunes Podcasts (ITPC), My Channels (MYCHANNELS)