QTreeWidget, i cant see the items

[clepto]

I add items to a treewidget but i cannot see them
i am usings qtjambi, here is the code, the libraryTree is the QTreeWidget

QTreeWidgetItem allItem = new QTreeWidgetItem(libraryTree);
        allItem.setText(1, "All");
        libraryTree.addTopLevelItem(allItem);

QTreeWidgetItem allItem = new QTreeWidgetItem(libraryTree);
        allItem.setText(1, "All");
        libraryTree.addTopLevelItem(allItem);

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