Using default 737 overhead in other aircraft?

I have tried copying and pasting the FSX default 737-800 overhead into other 3rd party panels cfg (e.g. PS737) and although it works quite well, I have found that in every case the fuel switches are inoperative - they only seem to work when the OH panel is used in the default aircraft. Does anyone know why this should be the case and whether there is someway to overcome this?Regards,Stuart Hyett