编写如下事件过程： Private Sub FOrm_ MouseDown (Button As Integer, Shift As Integer, X As Single, Y As Single) If Button = 2 Then Pint "AAAA" Then End If End Sub Private Sub Form_ MouseUp (Button As Integer, _ Shift As Integer, X As Single, Y As Single) Print "BBBB" End Sub程序运行后，如果在窗体上单击鼠标右键，则输出结果为______ 。