Editable table header

I want to doubleclick on a header in a QTableWidget and open an editor to change the text. Having trouble with the MVC paradigm. I created my own QHeaderView, and overrode mousedoubleclickevent(). Now I don't know what to do

Code:

class RowHeaderView : public QHeaderView
{
    Q_OBJECT
public:
    RowHeaderView(QWidget* parent=0) : QHeaderView(Qt::Vertical, parent) {
            setItemDelegate(&delegate);
    }
protected slots:
    virtual void mouseDoubleClickEvent( QMouseEvent *me ) {
        QModelIndex index = model()->index(logicalIndexAt(me->x(), me->y()), 0);
        //openPersistentEditor(index);
        QLineEdit *lineEdit = new QLineEdit(this);
        //QItemDelegate *delegate = new QItemDelegate(this);
        //delegate->createEditor(lineEdit, QStyleOptionViewItem() , QModelIndex());
        delegate.setEditorData();
    };
private:
    QItemDelegate delegate;
};
 
MyTableWidget::MyTableWidget(int rows, int columns)
		  : QTableWidget(rows, columns)
{
    RowHeaderView *rowHeaderView = new RowHeaderView(this);
    setVerticalHeader(rowHeaderView);
...