QAbstractTableModel, QTableView and restoreState.

Hi to all,
I used to save the QTableView horizontalHeader through saveState() and restore it by restoreState(...toByteArray()).
The model usually associated is a QSqlQueryModel. Now my QTableView is filled with a custom model inherited from QAbstractTableModel.

Code:

---

#ifndef CARTMODEL_H
#define CARTMODEL_H
 
#include <QtWidgets>
#include "ItemsCart.h"
 
class ItemsCart;
 
class CartModel : public QAbstractTableModel
{
    Q_OBJECT
 
public:
    CartModel(QObject *parent);
 
    void setCart(ItemsCart *inItemsCart);
 
    int rowCount(const QModelIndex &parent = QModelIndex()) const ;
 
    int columnCount(const QModelIndex &parent = QModelIndex()) const;
 
    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
 
    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
 
protected:
    ItemsCart *mItemsCart;
};
 
#endif

---

The problem I have is that restoreState() restore nothing, instead clears or hides all the horizontal headers.
Should I miss a function to reimplement?

Thanks in advance,

Danilo