I can't build my new mode to my Pixhawk1

I try to build my new mode in to my Pixhawk1. I Follow the Instructions in DEV ardupilot step by step but when I did it then my new mode didn’t appear on Mission Planner (Filght Mode Select) . How can I solve it?

it wont do that unless you also update mission planner, should be able to set the new mode number to one of the flight modes used by the switch in parameters, FLTMODE1 ect