Thank you for clearing that up.  MioMap is a very old program that really doesn't have much value anymore.  So if you can't find an exit button with MioMap I wouldn't be concerned.  I'm not familiar with AutoMapa.  Are you satisfied using that program?
I don't use the Visual unlock so I'm not familiar with its operation.  My unlock for my Mio C320 works as such.  When I start up my device, it starts as normal and when I see the MioMap icon I press it and it automatically goes to the unlock where I can then choose whatever program I wish.  If you want to see it, here's the link  
http://www.navitotal.com/showthread.php?8816-Mio-3.3-unlock-modified-for-use-w-Primo2  I don't know if it will work on your device though.  When I exit a program, it automatically returns back to the unlock where I can then choose another program if I wish.  When you exit a program does it go back to the unlock menu?