This brings up the main problem with FSUIPC. I know that you have to search the documents and then hope that you got the right function.
From my point of view it would be much easier if the functions (which are listed in the "List of FSX Controls") would have the same names according the functions in FSX. Information like "Toggle" could be added after the name of the function (i.e. Master Alternator "Toggle"). Sometimes it is quite hard and time consuming.
Don't get me wrong: FSUIPC is a really really great tool and opens up so many functions and possibilities!!! I really like working with it and I'm doing it for business since nearly two years. But sometimes I thing that it would be good to do a complete cleanup and overhaul. ;-)