Apple Logic Pro /LogicExpress Discussion

Hi,
In Logic Pro, when I record a keyboard part, I can edit and change 
notes in the Matrix Editor. However, I cannot find the midi information 
for the sustain foot pedal here, so how do I change and edit this 
information.
I can see vertical lines in the regions displayed in the arrange window 
for each use of the sustain pedal, but these cannot be edited.
Thanks, 
Tristan.