#include <CtrlLib/CtrlLib.h>
using namespace Upp;

struct App:TopWindow
{
	void Paint(Draw& w)override
	{
		w.DrawRect(GetSize(), Cyan());
//		w.DrawRect(GetSize()/2, SColorPaper());
		w.DrawRect(GetSize()/2, Null); // Do nothing, transparant background achieved.
	}
};

GUI_APP_MAIN
{
	App().Run();
}