QtTreePropertyBrowser/QTreeWidget Crash

#include <QtGui>

#include "qtpropertymanager.h"
#include "qteditorfactory.h"
#include "qttreepropertybrowser.h"
#include "qtbuttonpropertybrowser.h"
#include "qtgroupboxpropertybrowser.h"


int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QWidget *w = new QWidget();

    QtBoolPropertyManager *boolManager = new QtBoolPropertyManager(w);
    QtStringPropertyManager *stringManager = new QtStringPropertyManager(w);
    QtGroupPropertyManager *groupManager = new QtGroupPropertyManager(w);

    QtProperty *item0 = groupManager->addProperty("QObject");

    QtProperty *item1 = stringManager->addProperty("objectName");
    item0->addSubProperty(item1);

    QtProperty *item2 = boolManager->addProperty("enabled");
    item0->addSubProperty(item2);

    QtCheckBoxFactory *checkBoxFactory = new QtCheckBoxFactory(w);
    QtLineEditFactory *lineEditFactory = new QtLineEditFactory(w);
    
    QtTreePropertyBrowser *editor1 = new QtTreePropertyBrowser();
    editor1->setFactoryForManager(boolManager, checkBoxFactory);
    editor1->setFactoryForManager(stringManager, lineEditFactory);
    editor1->setResizeMode(QtTreePropertyBrowser::ResizeToContents);

    QVBoxLayout *layout = new QVBoxLayout();
    layout->addWidget(editor1);
    w->setLayout(layout);
    
    editor1->addProperty(item0);

    QListIterator<QtBrowserItem *> itItem(editor1->items(item1));
    while (itItem.hasNext())
    {
        QtBrowserItem *item = itItem.next();

        editor1->setItemVisible(item, false);
    }

    itItem = editor1->items(item2);
    while (itItem.hasNext())
    {
        QtBrowserItem *item = itItem.next();

        editor1->setItemVisible(item, false);
    }
    
    w->show();

    app.exec();
    return 0;
}