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main.cpp
#include <QtGui/QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

mainwindow.cpp
#include <QtGui>
#include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QWidget(parent)
{
    QVBoxLayout *bl = new QVBoxLayout(this);
    QComboBox *pcb = new QComboBox();

    pcb->addItem("1");
    pcb->addItem("2");
    pcb->addItem("3");
    bl->addWidget(pcb);
    bl->addStretch();
}

MainWindow::~MainWindow()
{

}

mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtGui>

class MainWindow : public QWidget
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();
};

#endif // MAINWINDOW_H

test.pro
#-------------------------------------------------
#
# Project created by QtCreator 2009-03-24T14:44:37
#
#-------------------------------------------------

TARGET = test
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

#include <QtGui>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QWidget w;
    QVBoxLayout bl(&w);
    QComboBox pcb;
//    pcb.addItem("1");
//    pcb.addItem("2");
//    pcb.addItem("3");
    bl.addWidget(&pcb);
    bl.addStretch();
    w.setLayout(&bl);
    w.show();
    return a.exec();
}