Problem emiting signal in QTreeWidgetItem's subclass

[Shawn]

Does MyTreeWidgetItem inherit QObject? What did you try so far?

Yes, it inherits QObject

class MyTreeWidgetItem : public QObject, public QTreeWidgetItem
{
	Q_OBJECT
 
public:
	MyTreeWidgetItem(QTreeWidget* parent);
	MyTreeWidgetItem(MyTreeWidgetItem* parent);
	~MyTreeWidgetItem();
 
	Element* pE;
signals:
	void itemClicked(MyTreeWidgetItem* item, int column);
 
private slots:
	void slot_itemSelected();
};
int Q_REGISTER_METATYPE(MyTreeWidgetItem*);

class MyTreeWidgetItem : public QObject, public QTreeWidgetItem
{
	Q_OBJECT

public:
	MyTreeWidgetItem(QTreeWidget* parent);
	MyTreeWidgetItem(MyTreeWidgetItem* parent);
	~MyTreeWidgetItem();
	
	Element* pE;
signals:
	void itemClicked(MyTreeWidgetItem* item, int column);

private slots:
	void slot_itemSelected();
};
int Q_REGISTER_METATYPE(MyTreeWidgetItem*);

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In QGraphicsItem, the enum QGraphicsItem::GraphicsItemChangeare sent as the state changes, and I can catch this and emit a signal, which "carrys" the Element* .

But in QTreeWidgetItem I can not find anything like GraphicsItemChange.

I tried to used the signal void itemClicked(QTreeWidgetItem* item, int column) in QTreeWidget, but it can only "return" QTreeWidgetItem*...