Drums controller for game rock band isn't recognized

[Battaglia]

Hi,

I'm new at the forum, so sorry if this subject was already mentioned,

I have a drum controller with a usb port, and when i tried to set up him for rock band, the game don't recognize, and when a try to change the type of pads, all they are recognize as a guitar, not a drum, and in this game, you can't change your instrument if isn't recognized.

I'm doing something wrong?

Thanks,