如何在Excel中填充颜色的同时保留网格线？

Dim xRgPre As Range
Private Sub Workbook_SheetSelectionChange(ByVal Sh As Object, ByVal Target As Range)
    On Error Resume Next
    If Not xRgPre Is Nothing Then DrawBorders xRgPre
    Set xRgPre = Target
End Sub
Private Sub DrawBorders(ByVal Rg As Range)
'Updateby Extendoffice 20160725
    Dim xCell As Range
    Application.ScreenUpdating = False
    For Each xCell In Rg
        If xCell.Interior.ColorIndex = xlNone Then
            With xCell.Borders
                If .ColorIndex = 15 Then
                    .LineStyle = xlNone
                End If
            End With
        Else
            With xCell.Borders
                If .LineStyle = xlNone Then
                    .Weight = xlThin
                    .ColorIndex = 15
                End If
            End With
        End If
    Next
    Application.ScreenUpdating = True
End Sub