QTreeView is empty

[t0bias]

hi,

i implemented this treeview in my form among other items:

Tree = new QTreeView(MainContainer);
    Tree->setObjectName("DirView");
    Tree->setGeometry(20, 90, 435, 120);
 
    QStringList dirsList;
    dirsList << "/usr" << "/opt" << "/home";
 
    QStandardItemModel dirs( 3, 1 );
    Tree->setModel(&dirs);
    for ( int i = 0; i < dirs.rowCount(); ++i )
    {       QStandardItem *item = new QStandardItem(QString::number(i));
        item->setCheckable( true );
        dirs.setItem( i, item );
    }

Tree = new QTreeView(MainContainer);
    Tree->setObjectName("DirView");
    Tree->setGeometry(20, 90, 435, 120);

    QStringList dirsList;
    dirsList << "/usr" << "/opt" << "/home";

    QStandardItemModel dirs( 3, 1 );
    Tree->setModel(&dirs);
    for ( int i = 0; i < dirs.rowCount(); ++i )
    {       QStandardItem *item = new QStandardItem(QString::number(i));
        item->setCheckable( true );
        dirs.setItem( i, item );
    }

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but the treeview now just is empty?
what did i do wrong?

thanks,

toby