this may seem insignificant, but when i was using project builder in 10.1, i thought i had files load into the same window, and then used the arrows in the top LH corner to move from one file to the next (i should point out that I am only working with very basic java files, no project "builds" or anything more complicated).
I can't seem to get this to work in 10.2's project builder. instead, every file I open is opened in a new window that cascades down the screen. Like I said, a trivial issue, but does anyone know where the setting is to change this?