求大神，我需要在下面代码中加一个，登陆成功同时打开一个名称为“操作菜单”的窗体，语句如何添加呢？

private Sub 登录系统_Click()
If IsNull(UserName) Then
  MsgBox "用户名不能为空，请重新选择！", vbExclamation + vbOKOnly, "提醒您！"
  Me.UserName.SetFocus
Else
If IsNull(password) Then
  MsgBox "注意，您忘了输入密码！", vbExclamation + vbOKOnly, "提醒您！"
  Me.password.SetFocus
Else
If DLookup("Password", "UserList", "Username='" & UserName & "'") = [password] Then
   Me.Visible = False
    Me.password = Null
    MsgBox "登录成功！", vbExclamation, "提醒您"

    DoCmd.OpenForm "操作菜单"

    Else
MsgBox "您输入的密码有误，请重新输入，注意大小写！", vbExclamation + vbOKOnly, "提醒您！"
Me.password = Null
Me.password.SetFocus


End If
End If
End If

End Sub