Select excel worksheets to print addition

I have come across this great VB code (attached) that allows me to select which worksheets to print,  As most sheets are printed each time, can someone suggest an amendment to either  select all with another check box or set  all checkboxes to ticked (true) so that I can instruct the user to unselect the ones not to print.

Sub SelectSheets()
    Dim i As Integer
    Dim TopPos As Integer
    Dim SheetCount As Integer
    Dim PrintDlg As DialogSheet
    Dim CurrentSheet As Worksheet
    Dim cb As CheckBox
    Application.ScreenUpdating = False

'   Check for protected workbook
    If ActiveWorkbook.ProtectStructure Then
        MsgBox "Workbook is protected.", vbCritical
        Exit Sub
    End If

'   Add a temporary dialog sheet
    Set CurrentSheet = ActiveSheet
    Set PrintDlg = ActiveWorkbook.DialogSheets.Add

    SheetCount = 0

'   Add the checkboxes

    TopPos = 40
    For i = 1 To ActiveWorkbook.Worksheets.Count
        Set CurrentSheet = ActiveWorkbook.Worksheets(i)
'       Skip empty sheets and hidden sheets
        If Application.CountA(CurrentSheet.Cells) <> 0 And _
            CurrentSheet.Visible Then
            SheetCount = SheetCount + 1
            PrintDlg.CheckBoxes.Add 78, TopPos, 150, 16.5
                PrintDlg.CheckBoxes(SheetCount).Text = _
                    CurrentSheet.Name
            TopPos = TopPos + 13
        End If
    Next i

'   Move the OK and Cancel buttons
    PrintDlg.Buttons.Left = 240

'   Set dialog height, width, and caption
    With PrintDlg.DialogFrame
        .Height = Application.Max _
            (68, PrintDlg.DialogFrame.Top + TopPos - 34)
        .Width = 230
        .Caption = "Select sheets to print"

    End With

'   Change tab order of OK and Cancel buttons
'   so the 1st option button will have the focus
    PrintDlg.Buttons("Button 2").BringToFront
    PrintDlg.Buttons("Button 3").BringToFront

'   Display the dialog box
    CurrentSheet.Activate
    Application.ScreenUpdating = True
    If SheetCount <> 0 Then
        If PrintDlg.Show Then
            For Each cb In PrintDlg.CheckBoxes
                If cb.Value = xlOn Then
                    Worksheets(cb.Caption).Activate
                    ActiveSheet.PrintOut
'                   ActiveSheet.PrintPreview 'for debugging

                End If
            Next cb
        End If
    Else
        MsgBox "All worksheets are empty."
    End If

'   Delete temporary dialog sheet (without a warning)
    Application.DisplayAlerts = False
    PrintDlg.Delete

'   Reactivate original sheet
    CurrentSheet.Activate
End Sub

Select allOpen in new window