non blocking example tkinter python UI in unreal engine 5

tkinter_in_unreal.py

from tkinter import *
import unreal


# non blocking example of tkinter, which ships with unreal
def show():
    window = Tk()
    window.title("TKinter test")
    window.geometry('350x200')

    def clicked():
        lbl.configure(text="Button was clicked !!")

    lbl = Label(window, text="Hello")
    lbl.grid(column=0, row=0)
    btn = Button(window, text="Click Me", command=clicked)
    btn.grid(column=1, row=0)

    unreal.parent_external_window_to_slate(window.winfo_id())

    def update(*args, **kwargs):
        window.update_idletasks()
        window.update()

    tick_handle = unreal.register_slate_post_tick_callback(update)