Minimal broken Go ui program

gistfile1.txt

package main

import (
	"github.com/andlabs/ui"
)

func mainWindow() {
	w2_button := ui.NewButton("Open Window 2")

	// Open window 2
	w2_button.OnClicked(func() {
		go newWindow()
	})

	main_interface := ui.NewVerticalStack(
		w2_button)

	main_w := ui.NewWindow("Window 1", 200, 200, main_interface)

	main_w.OnClosing(func() bool {
		ui.Stop()
		return true
	})

	main_w.Show()
}

func newWindow() {
	ok_button := ui.NewButton("OK")

	w2_interface := ui.NewVerticalStack(
		ok_button)

	w2 := ui.NewWindow("Window 2", 200, 200, w2_interface)

	// Close Window 2
	ok_button.OnClicked(func() {
		w2.Hide()
	})

	w2.Show()
}

func main() {
	go ui.Do(mainWindow)
	err := ui.Go()
	if err != nil {
		panic(err)
	}
}