public CustomTreeViewItem(string title)
{
bdd = new mediametrieEntities();
req = new requete();
Title.Text = title;
chkBox.Content = Title;
Title.AddHandler(TextBlock.MouseDownEvent, new MouseButtonEventHandler(change_label));
chkBox.AddHandler(CheckBox.CheckedEvent, new RoutedEventHandler(chkBox_Checked));
Header = chkBox;
}