main.cpp

#include <QtGui/QApplication>
#include "dialog.h"
#include "MyWidget.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Dialog *w = new Dialog;
    w->setGeometry(10,10,500,500);
    w->setLayout(new QHBoxLayout);
    MyWidget *My = new MyWidget(w);
    w->layout()->addWidget(My);



    w->show();
    My->show();
    return a.exec();
}