设已经在“菜单编辑器”中设计了窗体的快捷菜单,其顶级菜单为Bs,取消其“可见”属性,运行时,在以下事件过程中,可以使快捷菜单响应鼠标右键菜单的是( )。
A.Private Sub Form_Mouse Down(Button As Integer,Shift As Integer,- X As Single,Y As Single) If Button=2 Then PopupMenu Bs,2 End Sub B.Private Sub Form_MouseDown(Button As Integer,Shift As Integer,- X As Single,Y As Single) PopupMenu Bs End Sub C.Private Sub FOrm_MouseDown(Button As Integer,Shift As Integer,- X As Single,Y As Single) PopupMenu Bs,0 End Sub D.Private Sub Form_MouseDown(Button As Integer,Shin As Integer,- X As Single,Y As Single) If(Button=vbLeftButton)Or(Button=vbRightButton)Then PopupMenu Bs End Sub