When i add a child to model the subsequent offspring overwrites the previous , why??
Qt Code: 
  1. void MainWindow::addChild()
  2. {
  3.     qDebug()<<"Slot activ";
  4.     QModelIndex index = ui->treeView->selectionModel()->currentIndex();
  5.     QAbstractItemModel *model = ui->treeView->model();
  6.  
  7.     if (model->columnCount(index) == 0) {
  8.         if (!model->insertColumn(0, index))
  9.         {
  10.             return;
  11.         }
  12.     }
  13.  
  14.     if (!model->insertRow(0, index))
  15.     {
  16.         return;
  17.     }
  18.  
  19. int column = ui->treeView->selectionModel()->currentIndex().column();
  20. int row=ui->treeView->selectionModel()->currentIndex().row();
  21.  
  22.  
  23.     model->insertColumn(column , index);
  24.     model->setData(model->index(row, column, index), QVariant(linkWWW->text()), Qt::EditRole);
  25.     qDebug()<<column;
  26.  
  27.     model->insertColumn(column +1, index);
  28.     model->setData(model->index(row, column + 1 , index), QVariant(nameWWW->text()), Qt::EditRole);
  29.     qDebug()<<column;
  30.  
  31.     model->insertColumn(column +2, index);
  32.     model->setData(model->index(row, column + 2 , index), QVariant(tegWWW->text()), Qt::EditRole);
  33.     qDebug()<<column;
  34.  
  35.     model->insertColumn(column +3, index);
  36.     model->setData(model->index(row, column + 3 , index), QVariant(tegWWW->text()), Qt::EditRole);
  37.     qDebug()<<column;
  38.  
  39. }
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the first child added to child_1 child_3
second child added to child_4 child_6
as a result of the second child of the first erased