Regarding Scrollbar.....?

Hi all,

I m developing a alv report.after displaying the data in the grid in the footer the arrows column scrolling is in disable mode.

what i want is i want to fix 3 fields asleft fixed,and the remaing fields must scroll when i click on arrows.

firsr thing is ,how can we make enable those arrows for columnscrolling...

Regards,

Ravi..