How can i use vertical Scroll in ALV at web dynpro abap?

Normally, i'm using 'UP/DOWN button' while set a alv in web dynpro though,

wanna change to scroll vertically.

well, there is a way using ifram so i cant make alv inside of ifram for make a scroll.

but then, part of header also might be scroll together with data.

so, i'm asking to help is there anybody who can let me know about it?

Thanks.

with Regards,

Yui.