I know in Cubase 7 (and previous versions) once you activated the (W)rite button on anything it would magically appear but it seems to be a different method in 7.5
It will still magically appear when you hit the write button on the stereo output. (in the mixer)
Always been that way as far as I know.
i7 email@example.com, 12Gb, W7HP x64, Cubase 7.5.20 x64, Steinberg UR28M, Alphatrack, Wavelab Elements 7.2.1.