How create MapPolyline in locationUpdated?

[azspider]

Hi, i have this problem. I create app to trening. I would like to create a map that shows the current lines of the traveled path. I try do it in method locationUpdated because my class implement LocationListener. When i run my app on the map nothing happens.

public synchronized void updateMap(Location location) {
        QualifiedCoordinates qc = location.getQualifiedCoordinates();
        ......
        GeoCoordinate[] geo = new GeoCoordinate[2];
        geo[1] = new GeoCoordinate(qc.getLatitude(), qc.getLongitude(), 0);
        geo[2] = new GeoCoordinate(lastqc.getLatitude(), lastqc.getLongitude(), 0);
        MapPolyline track = mapFactory.createMapPolyline(geo);
        trasa.setVisible(true);
        map.addMapObject(track);
}

public void locationUpdated(LocationProvider provider, Location location) {
updateMap(location);
....
}

I would like to achieve the same effect as here (last image):

http://www.developer.nokia.com/Commu...20110629132515

what i doing wrong?