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

class App:public TopWindow {
	typedef App CLASSNAME;
	Button b;
	EditString e;
public:
	App(){
		b.SetLabel("Click me!"); //set the button text
		Add(b.HCenterPos(100).VCenterPosZ(30)); //add button to the window
		b.Add(e.HCenterPos(80).VCenterPos(20)); //add editfield to the button,
		                                        //positioning is relative to the button
		b<<=THISBACK(SwitchEdit);  // assign function to the button click
		e.Hide();                  // hide the editfield initialy
	}
	void SwitchEdit(){
		e.Show(!e.IsShown()); // switch the visibility
	}
};

GUI_APP_MAIN{
	App().Sizeable().Run();
}