second comp window in After Effects CC14

Hi,

The function to open up a second comp viewer (with a sub comp) to view two comps next to each other at the same time, SEEMS TO BE MISSING IN AE CC 14.

or does anyone know where I might find it.

It used to be in the comp pop-up menue at the upper left corner of the comp window. but it´s not there anymore....

thanks

a.