Apple Logic Pro 9 - Manual (Page 676)

Note: If using an independent Piano Roll Editor window, double-clicking an event opens
an independent Event List window.
To quickly open the Score Editor
µ
Option-double-click any event.
The Score Editor opens in a new window. The Piano Roll Editor remains docked in the
Arrange window’s editing area.
676 Chapter 23 Editing MIDI Events in the Piano Roll Editor