You did not say whether you are working with a GridControl or a GridDataControl. Also, are you trying to synchronize the vertical scrollbars or the horizontal scrollbars?
Here is a little sample that works to synchronize 2 GridControls both vertically and horizontally using the grid.HScrollBar.ValueChanged /grid.VScrollBar.ValuedChanged events. Depending upon your needs, you might remove some of the event handlers.
WpfApplication29_f33e1082.zip