Return code of FrmDoDialog()

[Horace Ho]

According to the doc:

        FrmDoDialog
        Purpose Display a modal dialog until the user taps a button in the dialog.
        Prototype Word FrmDoDialog (FormPtr frm)
        Parameters frm Pointer to memory block that contains the form.
->      Result Returns the number of the button the user tapped (first button is
        zero).
        Comments A button�s item number is determined by its order in the alert
        template; the first button has an item number of 0 (zero).

        See Also FrmInitForm, FrmCustomAlert

However, I found the FrmDoDialog() return the button ID instead.

Any comment?

Thanks