// main.cpp
#include <CtrlLib/CtrlLib.h>

using namespace Upp;

#define LAYOUTFILE <Gui16/dlg.lay>
#include <CtrlCore/lay.h>

struct MyApp : public WithDlgLayout<TopWindow> {
	MyApp() {
		CtrlLayout(*this, "MyDialog");
		
		btn << [=] { onClick(); };
	}
	
	virtual void Paint(Draw& w) override {
		w.DrawRect(GetSize(), Color(204, 255, 255));
	}
	
	void onClick() {
		PromptOK("Click Add");
	}
};

GUI_APP_MAIN
{
	MyApp().Run();
}

// dlg.lay
LAYOUT(DlgLayout, 208, 64)
	ITEM(Label, dv___0, SetLabel(t_("Label")).LeftPosZ(8, 36).TopPosZ(8, 19))
	ITEM(EditString, text, LeftPosZ(48, 92).TopPosZ(8, 19))
	ITEM(Option, option, SetLabel(t_("Option")).LeftPosZ(8, 108).TopPosZ(32, 15))
	ITEM(Button, btn, SetLabel(t_("asdasd")).SetFrame(ButtonFrame()).LeftPosZ(124, 56).TopPosZ(40, 15))
END_LAYOUT

virtual void Paint(Draw& w) override // virtual override is a nice addition - this will check that you indeed overriding this method
{
    w.DrawRect(GetSize(), Color ( 204, 255, 255 )); // <= enter your background color here
}

btnAddCustomer << [=] { btnAddCustomerClick(); }; // THISBACK is not needed in c++11 world and could be replaced with lambda.