I am using the newest release of the Arduino software, and I cannot seem to be able to open tabs. When I program, I am really picky about my workspace. I like to look back at other examples while I look at the current source code being edited. But the Arduino software won't let me open more than one tab. Why is this??? :-/
Sorry, that's just the way the program was designed (mirroring Processing). The idea was to keep things simple. The multiple tabs let you have more than one file in a sketch, but not more than one sketch open at a time.
Processing has since changed to allow you to have multiple windows open with a different sketch in each. This will probably get ported to Arduino at some point, but I'm not sure when.
Oh...Thanks. That's too bad...