import pyui_ng as ui

def main():
	app = ui.UI()
	window = ui.Window('Window', 800, 600)
	window.set_margined(True)
	
	def close(win: ui.Window):
		app.stop()
		return 0
		
	window.on_close(close)
	window.show()
	app.main()
	
main()

# this will not work
button = ui.Button("Click me")
button.on_click(lambda btn: print("hello"))

# this will work
button = ui.Button("Click me")
func = lambda btn: print("hello")
button.on_click(func)