Lightweight filter driver and device manager

Hi,

I am working on lightweight filter driver on windows 7 platform.
I can install the driver from “control panel” , driver gets loaded , I can capture the packets in my driver’s send and receive routines.
But I cannot see it in device manager (not even I select “Show hidden devices”)

But if I reboot the system , I can see it in device manager.

Can anybody explain me why it is like this ?

Thanks