// dans le code principal

Node *  Property::AddNode( Node *parent, QString name)
{
  QModelIndex index = model->indexFromNode( parent ,0 );
  model->beginInsertRow( index , 0);

  Node * node =new Node();
  node->displayName = name;
  node->background = Qt::transparent;
  node->forground = Qt::black;
  parent->childrens << node;
  node->parent = parent;

  model->endInsertRow();

  return node;
}

// dans le model


void PropertyViewModel::beginInsertRow(  const QModelIndex & parent, int row)
{
    beginInsertRows ( parent, row, row ) ;
}

void PropertyViewModel::endInsertRow()
{
    endInsertRows ( ) ;
}