Connecting QML signals with Qt slots

Here is an example of qml:

Code:

Item {
signal titleBarClicked()
 
MouseArea { 
   anchor.fill: parent
   onClicked: titleBarClicked()
}
}

and C++:

Code:

QDeclarativeEngine *engine = new QDeclarativeEngine;
QDeclarativeComponent component(engine, QUrl::fromLocalFile("qml/TestQML/TestQML.qml"));
QObject *myObject = component.create();
QDeclarativeItem *item = qobject_cast<QDeclarativeItem *>(myObject);
qDebug()<<QObject::connect(item, SIGNAL(titleBarClicked()), &viewer, SLOT(showMaximized()));

connect() return true, but slot is not called. What's wrong?

P.S. If you want to vote for this bug - go there