I'm coding a very simple Foundation Tool in Xcode. Basic stuff. When I type in something like: float circleArea(float theRadius) Xcode auto-completes and converts "float theRadius" into a weird looking bubble. If I click on the bubble and hit <Enter>, it disappears! If I double click, nothing happens. If I right-click, I just get the standard right click text menu (cut, copy, paste, balance, etc.). Does anyone know what these bubbles are? Thanks.