Fix panelGroup during vertical scroll

Hello, I have a panelGroup with buttons nested within another panelGroup containing a datatable. The users would like the buttons panelGroup to fix on screen when they scroll vertically, so that no matter where they scroll on screen, the buttons are always fixed at the center of the screen and visible. Is this possible?

[328 byte] By [Bart69a] at [2007-11-26 19:27:32]