如何通过combo pysimplegui使用列表中的值

import PySimpleGUI as sg

options = ['选项1', '选项2', '选项3']

layout = [[sg.Text('选择一个选项：')],
          [sg.Combo(options, key='-COMBO-', enable_events=True)],
          [sg.Button('提交')]]

window = sg.Window('Combo示例', layout)

while True:
    event, values = window.read()
    if event == sg.WINDOW_CLOSED:
        break
    elif event == '提交':
        selected_option = values['-COMBO-']
        sg.popup(f'你选择了：{selected_option}')