Question: I've created a checkbox that's also a QTreeWidgetItem using the code below. 

```
//Populate list
QTreeWidgetItem *program = createCheckedTreeItem(QString::fromStdString(itr->first), true);
treePrograms->addTopLevelItem(program);

```

---

```
QTreeWidgetItem* ConfigDialog::createCheckedTreeItem(QString name,bool checkBoxState)
{
  QTreeWidgetItem *item = new QTreeWidgetItem(QStringList(name));
  item->setFlags(item->flags()|Qt::ItemIsUserCheckable);
  if (checkBoxState)
  {
    item->setCheckState(0,Qt::Unchecked);
  }
  else
  {
    item->setCheckState(0,Qt::Checked);
  }
  return item;
}

```

I need a way of connecting a signal and slot for when the state of this checkbox is changed. The current way I've implemented this is below but unfortunately doesn't work. Can someone explain what I'm doing wrong and what I need to do in order to get it to connect?

```
connect(program, SIGNAL(toggled(bool)), this, SLOT(programChecked(bool)));

```

Answer: 
Your `QTreeWidgetItem` is directly linked to your model data, so you should connect to your QTreeWidget's model's `QAbstractItemModel::dataChanged` signal to be notified of the change.
You have to grab the signal `itemChanged ( QTreeWidgetItem * item, int column )` coming from [QTreeWidget](http://qt-project.org/doc/qt-4.8/qtreewidget.html).