QUiLoader - QVLayoutBox adjust Size

[hcts]

I'm writing a program using Qt and C++ to reach the following result:

a) vMain : main area - QVBoxLayout for the widget;

b) hHeader: header area - QHBoxLayout to show two QLabels;

c) vCenter: central area to host another widget loaded from ab ui file;

@#include <QtGui\QApplication>
#include <QtUiTools/QUiLoader>
#include <QMenuBar>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QPushButton>
#include <QLabel>
#include <QFile>
#include <QMessageBox>

int main(int argc, char *argv[])
{

QApplication app(argc, argv);

QWidget *window = new QWidget();


//Create main layout

QVBoxLayout *vMain = new QVBoxLayout();

window->setLayout(vMain);


//Create header layout

QHBoxLayout *hHeader = new QHBoxLayout;

vMain->addLayout(hHeader);

hHeader->addWidget(new QLabel("User"));

hHeader->addWidget(new QLabel("Module"));

//Create central area

QVBoxLayout *vCenter = new QVBoxLayout;

vMain->addLayout(vCenter);


//Create a widget from an ui file
QUiLoader loader;
QFile file("c:\\Logon.ui");
file.open(QFile::ReadOnly);
QWidget *myWidget = loader.load(&file, window);
file.close();

vCenter->addWidget(myWidget);

window->adjustSize();
window->show();

return app.exec();

}@
But the problem is that the main widget does not resize according the widget loaded from file.

Does anybody have any about what is incorrect in this code?