sorry that was my fault, I am using CL650/FCP/ap_eng which I can see via the dataref tool is correct. One interesting thing I noticed using DRT is that if I push the AP button in the virtual cockpit, I see command CL650/FCP/ap_eng being used, and I see a dataref for CL650/FCP/ap_eng changing to a value of 1. When I assign the same command to a button on the saitek panel and look at DRT, I do see the command being activated, but there is no corresponding dataref for CL650/FCP/ap_eng being changed to 1. This AP engage function is the only one I'm having this issue with...