What do you mean by "see the null object box"? You can still see null objects just like you could in CS6 as far as I know. Unless you've changed your view settings...
I use these:
Command + shift + H to toggle on off the controllers.
and Alt + mouse wheel (zoom in and zoom out) or Shift + mouse wheel (go back and forth) to navigate.
Yes, I had actually changed a few settings! Problem solved with the null object!
So, I also use these commands, but I'm saying that you press the mouse scrool, and can drag both in composition and in the timeline.
It would be to press the space bar, them using the mouse.