#include <qapplication.h>#include <qwidget.h>#include <qgroupbox.h>#include <qlabel.h>class MyMainWindow:public QWidget{ public:    MyMainWindow(); private:    QGroupBox *groupbox;    QLabel *label;};MyMainWindow::MyMainWindow(){ setGeometry(100,100,150,100);  groupbox = new QGroupBox(this); groupbox->setGeometry(10,10,130,80); groupbox->setTitle("A Group BOx"); label = new QLabel(this); label->setGeometry(30,35,90,40); label->setText("Add widgets\n here!"); label->setAlignment(AlignHCenter|AlignVCenter);}main(int argc,char **argv){ QApplication a(argc,argv); MyMainWindow w; a.setMainWidget(&w); w.show(); a.exec();}