why is the sender's type of the destroyed() signal QPushButtonPrivate?

[iwatsu]

I have a delegate class that inherits from QStyledItemDelegate. In SlotDestroyed(): why is sender() of the type QPushButtonPrivate and not QPushButton?

QWidget *Delegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option,	const QModelIndex &index) const
{
  QPushButton *btn = new QPushButton(parent);
  btn->setText("test");
 
  connect(btn, SIGNAL(destroyed(QObject*)), this, SLOT(SlotDestroyed(QObject*)));
  return btn;
}
 
 
void Delegate::SlotDestroyed(QObject* editor)
{
	QPushButton *btn = qobject_cast<QPushButton*>(sender()); // why null?
	QObject *s = sender();
	btn = reinterpret_cast<QPushButton*>(sender());
}

QWidget *Delegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option,	const QModelIndex &index) const
{
  QPushButton *btn = new QPushButton(parent);
  btn->setText("test");

  connect(btn, SIGNAL(destroyed(QObject*)), this, SLOT(SlotDestroyed(QObject*)));
  return btn;
}


void Delegate::SlotDestroyed(QObject* editor)
{
	QPushButton *btn = qobject_cast<QPushButton*>(sender()); // why null?
	QObject *s = sender();
	btn = reinterpret_cast<QPushButton*>(sender());
}

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