Can´t assign my FCB pedalboard to the MainStage 3 buttons

Hi.

So i recently got a FCB1010 Behringer MIDI pedalboard and i am going to use it connected to a Akai MPK61 MIDI controller.

I connected the MIDI cable from the "MIDI In" port on the MPK, to the "MIDI Out/Thru" port on the pedalboard.

The program (MainStage) is actually receiving the MIDI activity from all the pedals and buttons from the pedalboard, except for the "Switch 1 UP (ENTER)" and the "Switch 2 DOWN (ESCAPE)" buttons. The program perfectly assigns the pedals, but i can't assign the buttons to use them on the program. The program perfectly receives the MIDI information but it doesn't let me assign the buttons to any MainStage control.

These are the buttons that i want to assign:

Please, i would like to know how to assign the buttons to something like a button or a pad from MainStage.

Thank you.