[libreoffice-users] Macro not active when the document start

I'm using macro's function and it doesn't start when the document start. 
It would start if I change the value of the variabel at the function. 
The code is to change numeric value to string. If I execute the code: 
ubah(123) the result is "seratus dua puluh tiga". Any idea how to make 
the function executed when I open the document?

The code is:

Public Function ubah(x as currency) as String
    Dim triliun As Currency
    Dim milyar As Currency
    Dim juta As Currency
    Dim ribu As Currency
    Dim satu As Currency
    Dim sen As Currency
    Dim baca As String
    If x > 1000000000000 Then
       gusti = " Modul belum tersedia saat ini "
       Exit Function
    End If
    'Jika x adalah 0, maka dibaca sebagai 0
    If x = 0 Then
       baca = angka(0, 1)
    Else
       'Pisah masing-masing bagian untuk triliun, milyar, juta, ribu, 
rupiah, dan sen
       triliun = Int(x / 1000 ^ 4)
       milyar = Int((x - triliun * 1000 ^ 4) / 1000 ^ 3)
       juta = Int((x - triliun * 1000 ^ 4 - milyar * 1000 ^ 3) / 1000 ^ 2)
       ribu = Int((x - triliun * 1000 ^ 4 - milyar * 1000 ^ 3 - juta * 
1000 ^ 2) / 1000)
       satu = Int(x - triliun * 1000 ^ 4 - milyar * 1000 ^ 3 - juta * 
1000 ^ 2 - ribu * 1000)
       sen = Int((x - Int(x)) * 100)
       'Baca bagian triliun dan ditambah akhiran triliun
       If triliun > 0 Then
          baca = ratus(triliun, 5) + "triliun "
       End If
       'Baca bagian milyar dan ditambah akhiran milyar
       If milyar > 0 Then
          baca = ratus(milyar, 4) + "milyar "
       End If
       'Baca bagian juta dan ditambah akhiran juta
       If juta > 0 Then
          baca = baca + ratus(juta, 3) + "juta "
       End If
       'Baca bagian ribu dan ditambah akhiran ribu
       If ribu > 0 Then
          baca = baca + ratus(ribu, 2) + "ribu "
       End If
       'Baca bagian rupiah dan ditambah akhiran rupiah
       If satu > 0 Then
          baca = baca + ratus(satu, 1)
       End If
       'Baca bagian sen dan ditambah akhiran sen
       If sen > 0 Then
          baca = baca + ratus(sen, 0)
       End If
    End If
    ubah = UCase(Left(baca, 1)) & LCase(Mid(baca, 2))
End Function

Function ratus(x As Currency, Posisi As Integer) As String
    Dim a100 As Integer, a10 As Integer, a1 As Integer
    Dim baca As String
    a100 = Int(x * 0.01)
    a10 = Int((x - a100 * 100) * 0.1)
    a1 = Int(x - a100 * 100 - a10 * 10)
    'Baca Bagian Ratus
    If a100 = 1 Then
       baca = "Seratus "
    Else
       If a100 > 0 Then
          baca = angka(a100, Posisi) + "ratus "
       End If
    End If
    'Baca Bagian Puluh dan Satuan
    If a10 = 1 Then
       baca = baca + angka(a10 * 10 + a1, Posisi)
    Else
       If a10 > 0 Then
          baca = baca + angka(a10, Posisi) + "puluh "
       End If
       If a1 > 0 Then
          baca = baca + angka(a1, Posisi)
       End If
    End If
    ratus = baca
End Function

Function angka(x As Integer, Posisi As Integer)
    Select Case x
        Case 0: angka = "Nol"
        Case 1:
            If Posisi <= 1 Or Posisi > 2 Then
               angka = "Satu "
            Else
               angka = "Satu "
            End If
        Case 2: angka = "Dua "
        Case 3: angka = "Tiga "
        Case 4: angka = "Empat "
        Case 5: angka = "Lima "
        Case 6: angka = "Enam "
        Case 7: angka = "Tujuh "
        Case 8: angka = "Delapan "
        Case 9: angka = "Sembilan "
        Case 10: angka = "Sepuluh "
        Case 11: angka = "Sebelas "
        Case 12: angka = "Duabelas "
        Case 13: angka = "Tigabelas "
        Case 14: angka = "Empatbelas "
        Case 15: angka = "Limabelas "
        Case 16: angka = "Enambelas "
        Case 17: angka = "Tujuhbelas "
        Case 18: angka = "Delapanbelas "
        Case 19: angka = "Sembilanbelas "
    End Select
End Function




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