QItemEditorFactory and custom Model

[maximAL]

Hi,
i tried to define my own delegate editor for a custom Tree model used with a standard QTreeView.

seup is like this:

QItemEditorFactory *factory = new QItemEditorFactory();
  QItemEditorCreatorBase *lineEditorCreator =
        new QStandardItemEditorCreator<LineEditorCreator>();
  factory->registerEditor(QVariant::String, lineEditorCreator);
  QItemEditorFactory::setDefaultFactory(factory);
 
  SceneModel model("test.xml");
 
  QTreeView view;
  view.setModel(&model);
  view.show();

QItemEditorFactory *factory = new QItemEditorFactory();
  QItemEditorCreatorBase *lineEditorCreator =
        new QStandardItemEditorCreator<LineEditorCreator>();
  factory->registerEditor(QVariant::String, lineEditorCreator);
  QItemEditorFactory::setDefaultFactory(factory);
  
  SceneModel model("test.xml");

  QTreeView view;
  view.setModel(&model);
  view.show();

To copy to clipboard, switch view to plain text mode 

this is the delegate (yes, it's only for testing):

class LineEditorCreator : public QLineEdit
{
  Q_OBJECT
  Q_PROPERTY(QString text READ text WRITE setText USER true)
 
public:
  LineEditorCreator(QWidget *widget = 0):
    QLineEdit(widget)
  {
  };
 
  QString text() const
  {
    return QLineEdit::text();
  };
 
  void setText(QString text)
  {
    QLineEdit::setText(text);
  };
 
};

class LineEditorCreator : public QLineEdit
{
  Q_OBJECT
  Q_PROPERTY(QString text READ text WRITE setText USER true)

public:
  LineEditorCreator(QWidget *widget = 0):
    QLineEdit(widget)
  {
  };

  QString text() const
  {
    return QLineEdit::text();
  };

  void setText(QString text)
  {
    QLineEdit::setText(text);
  };

};

To copy to clipboard, switch view to plain text mode 

i can also add the code for the model, but to my understanding it shouldn't interfere with the delegate.
without the custom delegate, editing works fine (so, yes, items are editable), with the delegate just nothing happens (and it's functions aren't called at all).

for testing purpose, i also tried with a standard QTreeWidget and the delegate works just fine there.

are there any special additions to be made to an model, so it supports the delegate?