AddHandler GridControl1.FirstVisibleRowChanged, AddressOf Me.GridControl1_FirstVisibleRowChanged

AddHandler GridControl1.FirstVisibleColumnChanged, _
                              AddressOf Me.GridControl1_FirstVisibleColumnChanged 

Private Sub GridControl1_FirstVisibleRowChanged(ByVal sender As Object, ByVal e As System.EventArgs)
  GridControl2.FirstVisibleRow = gridControl2.DataRows( CType( GridControl1.FirstVisibleRow, _
                                                        Xceed.Grid.DataRow ).Index)
End Sub 

Private Sub GridControl1_FirstVisibleColumnChanged(ByVal sender As Object, _
                                                   ByVal e As System.EventArgs)

  If Not GridControl1.FirstVisibleColumn Is Nothing And _
     Not GridControl2.FirstVisibleColumn Is Nothing Then

    GridControl2.FirstVisibleColumn = GridControl2.Columns( GridControl1.FirstVisibleColumn.Index )
  End If
End Sub

gridControl1.FirstVisibleRowChanged += new EventHandler( this.gridControl1_FirstVisibleRowChanged );

gridControl1.FirstVisibleColumnChanged +=
                 new EventHandler( this.gridControl1_FirstVisibleColumnChanged ); 

private void gridControl1_FirstVisibleRowChanged(object sender, System.EventArgs e)
{
  gridControl2.FirstVisibleRow = 
            gridControl2.DataRows[ ( ( Xceed.Grid.DataRow )ridControl1.FirstVisibleRow ).Index ];
} 

private void gridControl1_FirstVisibleColumnChanged(object sender, System.EventArgs e)
{
  if( gridControl1.FirstVisibleColumn != null && gridControl2.FirstVisibleColumn != null )
    gridControl2.FirstVisibleColumn =
            gridControl2.Columns[ gridControl1.FirstVisibleColumn.Index ];                

}