Second window from a button click on flet

[Samwellwang]

I want to implement a function where a window has a button that opens another window after clicking it.

`import flet as ft
import threading

def open_second_window():
# 第二个窗口的应用逻辑
def second_window(page: ft.Page):
page.add(ft.Text("这是第二个窗口"))

# 启动第二个窗口
ft.app(target=second_window)

def main(page: ft.Page):
def on_click(e):
# 使用线程启动第二个窗口
threading.Thread(target=open_second_window).start()

# 创建一个按钮
button = ft.Button(text="打开第二个窗口", on_click=on_click)

# 在第一个窗口中添加按钮
page.add(button)

启动第一个窗口

ft.app(target=main)
`

but it doesn't work . shows:
ValueError: signal only works in main thread of the main interpreter

[EGAMAGZ]

I'm having the same issue

[ndonkoHenri]

We are waiting on flutter/flutter#142845 for a proper way to have multi-windows.