class MichaluvTest : public WithMichaluvTestLayout<TopWindow> {
public:
	void ActionClose();
	MichaluvTest();
	typedef MichaluvTest CLASSNAME; // <------
};

MichaluvTest::MichaluvTest()
{
	CtrlLayout(*this, "Window title");
	close << [=] { Break(); }; // 1) We use a lambda function to define the event.
                                   // 2) The method to break the main loop is Break(), not Breaker()
}

GUI_APP_MAIN
{
	MichaluvTest().Run();
}