Pro Tools:Edit mulitrack MIDI data in the same editor

Pro Tools: edit multitrack MIDI data
To edit multitrack MIDI data in the piano roll editor:

Open the MIDI editor and then click the dot next to each track who's data you wish to display (displayed in image below).

To choose which track to write to:

Highlight the pencil tool of the respective track (displayed in image below). To select more than one pencil icon hold Shift and select it. This will allow you to add data to multiple tracks at once.