Lock the bouqet as discribed above. Then go to settings, parental lock, change the pin to whatever you desire, change prompt for pin to on locked bouqets. You will now ned to enter the pin whenever you want to view the channels, enter parental control or enter the services menu so don't forget it. BTW you can not hide and lock the bouqet you can only do one or the other.
Hope this helps,
de_deej