autopilot wont switch off on Saitek Multi Panel

Hi - I have Saitek yoke, throttle, trim, rudder, 2 radio panels, switch panel and multi-panel. I fly Cessna 172 default aircraft in FSX. I have basic FSUIPC installed. PC o/s XP

When I engage the Autopilot using the multi-panel button, the A/P features all function. However, when I switch off, using the multi-panel A/P button, the A/P doesn't switch off and I have to also use the mouse

to switch off A/P on the on-screen fsx console.

This is irritating and of course I would like the multi panel button to do the job on its own. Anyone help please. regards Dennis - (novice simmer)