Q3TabDialog doesn't work as QTabDialog from Qt3

Running the code below results in the OK button to be on top of the tabs.
Running an equivalent Qt3 code version results in the OK button to be correctly shown on the bottom.

// ------------------------------------------
#include <QtGui>
#include <Qt3Support>

class AliceLoadMenuWindow : public Q3TabDialog

{ Q_OBJECT private: Q3HBox* geomBox; Q3HBox* ilumBox; Q3VGroupBox* fila1Geom; QCheckBox* resetCB; Q3ButtonGroup* fila1Ilum; QRadioButton *ilumDefecto; QRadioButton *ilumModelos; public: AliceLoadMenuWindow(QWidget* parent=0, const char* name=0); }; class test: public Q3MainWindow { Q_OBJECT public: test(QWidget *parent=0, const char *name=0); public slots: void slotSave(); }; AliceLoadMenuWindow:: AliceLoadMenuWindow(QWidget* parent, const char* name) : Q3TabDialog(parent,name,TRUE) { geomBox = new Q3HBox(this); ilumBox = new Q3HBox(this); addTab(geomBox,tr("tab1")); addTab(ilumBox,tr("tab2")); fila1Geom = new Q3VGroupBox(geomBox); resetCB = new QCheckBox(tr("CB"),fila1Geom); resetCB->setChecked(TRUE); fila1Ilum = new Q3ButtonGroup(1,Qt::Horizontal,ilumBox); ilumDefecto = new QRadioButton(tr("RB1"),fila1Ilum); ilumModelos = new QRadioButton(tr("RB2"),fila1Ilum); }

test::test(QWidget *parent, const char *name)
:Q3MainWindow(parent,name,0)
{
slotSave();
}

void test::slotSave()
{
AliceLoadMenuWindow* aliceLoadMenuWindow = new AliceLoadMenuWindow(this);
aliceLoadMenuWindow->exec();
delete aliceLoadMenuWindow;
}

int main( int argc, char ** argv )
{
QApplication a( argc, argv );
test t;
t.resize( 700, 800 );
t.show();
return a.exec();
}

#include "test.moc"
// ------------------------------------------