如果需要在Myform=CreateObject( Form )所创建的表单对象Myform中添加commandl按钮对象，应当使用命令______。
A．Add Object Commandl AS commandbutton
B．MyforAddobject("commandl","commandbutton")
C．MyforAddobject("commandbutton","commandl")
D．commandl=Addobject("comandl","commandbutton")