MyApp::MyApp() {
   Button b;
   ...
   myArray.SetCtrl(0,0,b);
}

#include <CtrlLib/CtrlLib.h>

using namespace Upp;

#define LAYOUTFILE <Test/Test.lay>
#include <CtrlCore/lay.h>

class ArrayTest : public WithArrayTestLayout<TopWindow> {
public:
	typedef ArrayTest CLASSNAME;
	ArrayTest();
	
	Array<Button> btn;
	Array<Option> opt;
};

ArrayTest::ArrayTest()
{
	CtrlLayout(*this, "Window title");
	Sizeable().Zoomable();
	
	myArray.AddColumn("Column1");
	myArray.AddColumn("Column2");
	
	for(int i = 0; i < 100; i++) {
		myArray.Add("Row: " + AsString(i + 1));
		if(i & 1) {
			Button& b = btn.Add();
			b.SetLabel(Format("Button %d", i + 1));
			myArray.SetCtrl(i, 1, b);
		}
		else {
			Option& o = opt.Add();
			o.SetLabel(Format("Option %d", i + 1));
			myArray.SetCtrl(i, 1, o);
		}
	}
}

GUI_APP_MAIN
{
	ArrayTest().Run();
}