Implementation of TouchArea using TUIO API for QML application

Sil20

Hello,
For one of my project We implemented a QML plugin not to be dependent to QT evolutions on multitouch Touchareas.
It works perfectely using Windows event. But we need to be abble to touch 2 separated touch screens simultaneously.
We found the TUIO implementation, and I started adding the code into my plugin. It works but we have to manage every thing inside :

ToucheArea overlaping / Depth
toucheArea coordinate computations
TUIO send the globale normalised position of the touch point in the whole windows desktop
My class is defined like this:
@class QDeclarativeTouchArea : public QDeclarativeItem , TUIO::TuioListener
{@

I have several questions:

In My QML Application I have a List of QDeclarativeTouchArea, How to sort them from the one at the top to the one at the bottom? Since in QML the z property AND the instanciation order defined both the depth of hte instance?
How to get the coordinates of the touche Area in the global windwos desktop?

Here is a simplified illustration of the situation:
!http://imageshack.us/a/img197/2268/ppx1.jpg
(TUIO Illustration)!

Sil20

Hello I manage to go forward I try to generat an QtouchEvent, and to post it to the QApplication, in order to use the native QT filtering:
@bool QDeclarativeTouchArea::event(QEvent *event)@
@bool QDeclarativeTouchArea::sceneEventFilter(QGraphicsItem *i, QEvent *event)@

The problem is:

the coordinate of the point coming from TUIO is correct
the event is send
But none of my touch areas received the events!!
The native windows touch events are received properly!

Here after is the code for the TUIO to QT event mapping function.
@bool QDeclarativeTouchArea::tuioToQtEvent(TUIO::TuioCursor *tcur, QEvent::Type eventType)
{
//Create Event structure
QTouchEvent event(eventType);
QListQTouchEvent::TouchPoint touchPoints = event.touchPoints();
QTouchEvent::TouchPoint p;

//Get Normalized globale position
QPointF lp;
lp.setX(tcur->getPosition().getX());
lp.setY(tcur->getPosition().getY());

int id = tcur->getCursorID();

//Set Values
p.setNormalizedPos(lp);
p.setId(id);

//p.setPressure(point->pressure);
//p.setRect(point->area);
//p.setScreenPos(point->area.center());

switch (eventType) {
    case QEvent::TouchBegin:
    {
        p.setState(Qt::TouchPointPressed );
        touchPoints.append(p);
        break;
    }
    case QEvent::TouchUpdate:
    {
        p.setState(Qt::TouchPointMoved);
        touchPoints.append(p);
        break;
    }
    case QEvent::TouchEnd:
    {
        p.setState(Qt::TouchPointReleased );
        touchPoints.append(p);
        //touchPoints. Update Existing
        break;
    }
    default:
    {
        break;
    }
}

//copy data into event structure
event.setTouchPoints(touchPoints);

//Send Event to main application
qDebug()<< "QDeclarativeTouchArea::tuioToQtEvent"<< "QApplication::sendEvent(QApplication::instance(), &event)";
QApplication::sendEvent(QApplication::instance(), &event);

return true;

}@