Whitespace characters in windows or flash

Something weird happened just now. While typing away in an as file, i hit a special secret key combo and suddenly I have whitespace characters. I have no idea what combo I pressed, so I have no idea how to turn it off. Also, I don't know if it is a windows feature or flash feature. Googeling gave nothing. Anyone know how to turn this on/off?

http://www.29er.no/ihoss/images/whitespace.PNG

Sorry if this is in the wrong forum. I'm just assuming it's a windows thing, hence not a technical flash question.

[Edit] It only happened to that file though, and closing it and reopening it did not fix the problem. Also, smaller image :)

[Edit] Ok, seems like it was a flash thing. Hit Ctrl+Shift+8 to turn it on/off.