test_option_container_empty_box.py

import toga

class StartApp(toga.App):
    def startup(self):
        self.main_window = toga.MainWindow(self.name)
        self.main_window.app = self

        main_content = toga.OptionContainer(content=[('b1', toga.Box()),
                                                    ('b2', toga.Box())])

        self.main_window.content = main_content
        self.main_window.show()

def main():
    app = StartApp('OptionContainer Test', 'org.pybee.test')
    app.main_loop()

if __name__ == '__main__':
    main()