C++ to QML data model (QObject list)

[spode]

Here the problem is that, on clicking one item of the list, everything desappears. Problem of pointers?
here the source code (progetto LGPL): http://www.crocko.com/981BCEFE3C9D4C239D730E1F022B478E/Tecnophobie.zip

the list is in main.qml