void AmazonItemTreeView::dataChanged( const QModelIndex &topLeft, const QModelIndex &bottomRight )
{
    qDebug() << "dataChanged";

    int i = 0;
    QModelIndex index = model()->index( i, 1 );

    // show only albums with price, hide the rest
    while( index.isValid() )
    {
        qDebug() << "another one";
        if( index.data() == QString() )
        {
            qDebug() << "let's hide";
            setRowHidden( i, QModelIndex(), true );
        }
        i++;
        index = model()->index( i, 1 );
    }

    QTreeView::dataChanged( topLeft, bottomRight );

    header()->setResizeMode( 1, QHeaderView::ResizeToContents );
    header()->setResizeMode( 0, QHeaderView::Stretch );
}