The following example uses the Module property to insert the Beep method in a form's Open event.
Dim strFormOpenCode As String
Dim mdl As Module
Set mdl = Forms!MyForm.Module
strFormOpenCode = "Sub Form_Open(Cancel As Integer)" _
& vbCrLf & "Beep" & vbCrLf & "End Sub"
With mdl
.InsertText strFormOpenCode
End With