Programming button controller for flaps

I can get the gear toggle to work fine on my throttle quadrant with a button. However, the flaps don't seem to work and I have to pan down and click on the lever. I may just have the incorrect button assignment. Is anyone else having this issue? I think I read somewhere I may need a Lua script or something. Any advice greatly appreciated.

BTW, outstanding aircraft and fun to fly. Taxiing was a bear at first but I'm getting the hang of it. Multiple throttle levers a must!