Unsolved Add in qml combobox serial port name seach in C++

[alou1984]

hello .
I want to add in my combobox define in my qml file all serial port name available .
Debug() function print correctely port names but combo box in app is empty..... please help...

// C++
int main(int argc, char *argv[])
{
QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
QGuiApplication app(argc, argv);
QQmlApplicationEngine engine;

QQmlComponent component(&engine, QUrl(QLatin1String("qrc:/main.qml")));
QObject *object = component.create();

QStringList lport;
QList<QSerialPortInfo> ListPort;
ListPort = QSerialPortInfo::availablePorts();

qDebug() << "Number of serial ports:" << ListPort.count();
for (int i=0; i < ListPort.size();i++)
{
    qDebug() << "Names of serial ports:" << ListPort.at(i).portName();
    lport << ListPort.at(i).portName();
}
QObject * ComboPort = object->findChild<QObject*>("cb_port");
if (ComboPort)
 {
        ComboPort->setProperty("cbItems",lport);
 }
return app.exec();

}

// Qml

ComboBox {
id: cb_port
objectName: "cb_port"
x: 480
y: 91
anchors.bottom: parent.bottom
anchors.bottomMargin: 519
model: cbItems
}