Password Protect folders in iPhone

Please move this thread/question to a right forum if this is not the place where it belongs.

One of the main features of iOS4.0 is to organize apps into folders. Is there a way to password protect at that folder level? for example i create on folder that contains Mail, SMS and couple of other apps. Can i password protect that folder so that everytime a passcode has to be entered to access the apps within that folder.

Thanks
Aykay