Well, I tested clicking the stick base and anywhere else at or next to the stick, also with BS and any key modifier I could think of, but no success. I guess hiding the sting is simply not possible. I also could not find any corresponding command in the controls table. I am just flying SU-27 FC training lessons atm but it's the same behaviour during a normal mission. May be it's a hidden key binding somewhere hidden deeply in the core or only avaialble in another model than the SU-27, just guessing. Anyway, thanks for your help. I guess, I have to live with it.