autostart portable apps when usb stick is in

Hello,

i installed portable apps on my USB-Stick successfully.
After i put it in i got a windows 7 splash screen which let me choose an action (import videos and pictures, open folder, ...).
I always had to start PortableApps manually by starting the "Start.exe" in the top folder.

Isnt it possible to autostart it when i put my usb-stick in the port?

i edited the autorun.inf as following:

[Autorun]
Icon=PortableApps\PortableApps.com\App\Graphics\usb.ico
Label=PortableApps.com
open=Start.exe

But nothing happend. I always get the splash screen.

Has anyone some hints for that stupid problem?

Thx so far.