You can do this using Global Tracks:
Above the Track List in the Arrange click on global tracks to show it or press 'G'.
Control-click on Global Tracks to select what Global Tracks you wish to view.
I have located the global view and my song is in C.
Now how do I change the key to my song to say D?
I am taking advantage of "Green Day" and ordering "Mixing Electronica with Olav Basoski!" Should be fun