如何将一个panedWindow放在另一个panedWindow tkinter后面

import tkinter as tk

root = tk.Tk()
root.geometry("400x300")

main_paned_window = tk.PanedWindow(root, orient=tk.HORIZONTAL)
main_paned_window.pack(fill=tk.BOTH, expand=True)

child_paned_window = tk.PanedWindow(main_paned_window, orient=tk.VERTICAL)
main_paned_window.add(child_paned_window)

label = tk.Label(child_paned_window, text="Hello, World!")
child_paned_window.add(label)

button = tk.Button(child_paned_window, text="Click Me!")
child_paned_window.add(button)

root.mainloop()