Adobe Acrobat X vba PartDocs(0).InsertPages(n - 1, PartDocs(i), 0, ni, True) does not create bookmarks

Found this awesome bit of code to create a single pdf file from a given folder, but i can't get it to create bookmarks when inserting.

In the Acrobat and PDF Library API Reference: InsertPages(long nInsertPageAfter,  LPDISPATCH iPDDocSource,long nStartPage, long nNumPages, long bBookmarks)   For bBookMarks - If a positive number, bookmarks are copied from the source document. If 0, they are not.

I found the i have tried all of these options:

PartDocs(0).InsertPages(n - 1, PartDocs(i), 0, Ni, True)
PartDocs(0).InsertPages(n - 1, PartDocs(i), 0, Ni, 1)
PartDocs(0).InsertPages(n - 1, PartDocs(i), 0, Ni, -1)

What am i missing?  any help would be greatly appreciated.

Private Sub Command75_Click()
On Error GoTo Err_Command75_Click
    Const DestFile As String = "MergedFile.pdf" ' <-- change to suit
    Dim MyPath As String, MyFiles As String
    Dim a() As String, i As Long, f As String
     ' Choose the folder or just replace that part by: MyPath = Range("E3")
    With Application.FileDialog(msoFileDialogFolderPicker)
         '.InitialFileName = "C:\Temp\"
        .AllowMultiSelect = False
        If .Show = False Then Exit Sub
        MyPath = .SelectedItems(1)
        DoEvents
    End With

  ' Populate the array a() by PDF file names
    If right(MyPath, 1) <> "\" Then MyPath = MyPath & "\"
    ReDim a(1 To 2 ^ 14)
    f = Dir(MyPath & "*.pdf")
    While Len(f)
        If StrComp(f, DestFile, vbTextCompare) Then
            i = i + 1
            a(i) = f
        End If
        f = Dir()
    Wend
     ' Merge PDFs
    If i Then
        ReDim Preserve a(1 To i)
        MyFiles = Join(a, ",")
    '    Application.StatusBar = "Merging, please wait ..."
        Call MergePDFs(MyPath, MyFiles, DestFile)
     '   Application.StatusBar = False
    Else
        MsgBox "No PDF files found in" & vbLf & MyPath, vbExclamation, "Canceled"
    End If

Exit_Command75_Click:
    Exit Sub
Err_Command75_Click:
    MsgBox err.Description
    Resume Exit_Command75_Click
End Sub

Public Sub MergePDFs(MyPath As String, MyFiles As String, Optional DestFile As String = "MergedFile.pdf")
     ' ZVI:2013-08-27 http://www.vbaexpress.com/forum/showthread.php?47310-Need-code-to-merge-PDF-files-in-a-fol der-using-adobe-acrobat-X
     ' Reference required: VBE - Tools - References - Acrobat

    Dim a As Variant, i As Long, n As Long, Ni As Long, p As String
    Dim AcroApp As New Acrobat.AcroApp, PartDocs() As Acrobat.CAcroPDDoc

    If right(MyPath, 1) = "\" Then p = MyPath Else p = MyPath & "\"
    a = Split(MyFiles, ",")
    ReDim PartDocs(0 To UBound(a))

    On Error GoTo exit_
    If Len(Dir(p & DestFile)) Then Kill p & DestFile
    For i = 0 To UBound(a)
         ' Check PDF file presence
        If Dir(p & Trim(a(i))) = "" Then
            MsgBox "File not found" & vbLf & p & a(i), vbExclamation, "Canceled"
            Exit For
        End If
         ' Open PDF document
        Set PartDocs(i) = CreateObject("AcroExch.PDDoc")
        PartDocs(i).Open p & Trim(a(i))
        If i Then
             ' Merge PDF to PartDocs(0) document
            Ni = PartDocs(i).GetNumPages()
'            If Not PartDocs(0).InsertPages(n - 1, PartDocs(i), 0, Ni, True) Then
            If Not PartDocs(0).InsertPages(n - 1, PartDocs(i), 0, Ni, -1) Then
                MsgBox "Cannot insert pages of" & vbLf & p & a(i), vbExclamation, "Canceled"
            End If
             ' Calc the number of pages in the merged document
            n = n + Ni
             ' Release the memory
            PartDocs(i).Close
            Set PartDocs(i) = Nothing
        Else
             ' Calc the number of pages in PartDocs(0) document
            n = PartDocs(0).GetNumPages()
        End If
    Next

    If i > UBound(a) Then
         ' Save the merged document to DestFile
        If Not PartDocs(0).Save(PDSaveFull, p & DestFile) Then
            MsgBox "Cannot save the resulting document" & vbLf & p & DestFile, vbExclamation, "Canceled"
        End If
    End If

exit_:

     ' Inform about error/success
    If err Then
        MsgBox err.Description, vbCritical, "Error #" & err.Number
    ElseIf i > UBound(a) Then
        MsgBox "The resulting file is created:" & vbLf & p & DestFile, vbInformation, "Done"
    End If

     ' Release the memory
    If Not PartDocs(0) Is Nothing Then PartDocs(0).Close
    Set PartDocs(0) = Nothing

     ' Quit Acrobat application
    AcroApp.Exit
    Set AcroApp = Nothing
End Sub

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