How can I turn off gridlines in excel using VBA, without using ActiveWindow

Question

I have a VBA macro over Excel 2013 which generate a separate excel report. In this excel report that is created, I would like to turn off the GridLines.

The only piece of code that I come across to make this happens is as below

ActiveWindow.DisplayGridlines = False

However, this excel is generated in the background ie,

Dim appObject As New Excel.Application
appObject.Visible = False

Which means that this report is not the ActiveWindow. Is there an alternate way of turning off the gridlines without using the ActiveWindow object?

Answer 1

If you have a reference to the workbook, you can just iterate over all of the Windows in its collection. If the application isn't visible, you should only get 1 but it's safer than trying to hard code an index:

Private Sub ToggleGridLines(target As Workbook)
    Dim wnd As Window
    For Each wnd In target.Windows
        wnd.DisplayGridlines = False
    Next
End Sub

Note that this will set change the display on the active worksheet in the workbook - why this is a property of the window and not the worksheet is beyond me.

EDIT:

Thanks to the link that @Tim shared, I realized I'd completely spaced off the SheetViews collection. This should turn off gridlines for an arbitrary Worksheet object:

Private Sub TurnOffGridLines(target As Worksheet)
    Dim view As WorksheetView
    For Each view In target.Parent.Windows(1).SheetViews
        If view.Sheet.Name = target.Name Then
            view.DisplayGridlines = False
            Exit Sub
        End If
    Next
End Sub

Answer 2

The ActiveWindow is a member of the Windows objects collection. As with any collection, simply refer to the actual window by name rather than by specifying the active window. eg

Windows("My Workbook.xls").DisplayGridlines = False

Answer 3

We can either do it as "Comintern" suggested or activating the wanted sheets to execute de adequate line of code in a loop. I tried the code posted above in several ways and I'm posting the snippet that worked the best for me:

Sub GridLines(Optional target As Worksheet, Optional display As Boolean = True)

    Dim oWnd As Window
    Dim oShView As WorksheetView
    If IsMissing(target) Or target Is Nothing Then
        For Each oShView In ActiveSheet.Parent.Windows(1).SheetViews
            oShView.DisplayGridlines = display
        Next
    Else
        For Each oShView In target.Parent.Windows(1).SheetViews
            If oShView.Sheet.Name = target.Name Then
                oShView.DisplayGridlines = display
                Exit For
            End If
        Next
    End If
    Set oShView = Nothing
    Set oWnd = Nothing
End Sub

Any feedback is very welcomed