Welcome to the forums.

This is a pure guess on my part. I don't use Grids so I really don't have anything to test it on, but if I were going to try this, I would do something like
Code:
Private Sub MSHFlexGrid1_Scroll()
MSHFlexGrid2.TopRow = MSHFlexGrid1.TopRow
End Sub

Private Sub MSHFlexGrid2_Scroll()
MSHFlexGrid1.TopRow = MSHFlexGrid2.TopRow
End Sub