如何在我的tkinter组合框的下拉列表中添加值？

import tkinter as tk
from tkinter import ttk

def on_select(event):
    selected_value = combobox.get()
    print("Selected value:", selected_value)

root = tk.Tk()

values = ['Value 1', 'Value 2', 'Value 3']  # 定义要添加的值列表

combobox = ttk.Combobox(root, values=values)  # 创建Combobox并设置values属性
combobox.bind("<<ComboboxSelected>>", on_select)  # 绑定选中事件
combobox.pack()

root.mainloop()