I am getting an extra row and can some one correct my code

[Qt Enthusiast]

void myWidget::createTree() 
{
  QAbstractItemModel* const mdl = m_tree->model();
  mdl->removeRows(0,mdl->rowCount());
  mdl->removeColumns(0,mdl->columnCount());
  mdl->insertRows(0,2);
       
  QModelIndex tempIdx; 
  QModelIndex top1Idx = tempIdx = mdl->index(0,0);
  mdl->insertRow(0,tempIdx);
  tempIdx = mdl->index(0,0);
  mdl->setData(tempIdx,"A");
  mdl->setData(tempIdx,m_stacked->addWidget(mapWidgetNameToTextBrowser["A"]),Qt::UserRole);
        
  QModelIndex top2Idx = tempIdx  = mdl->index(1,0);
  mdl->insertRow(0,tempIdx);
  tempIdx = mdl->index(1,0);
  mdl->setData(tempIdx,"B");
  mdl->setData(tempIdx,m_stacked->addWidget(mapWidgetNameToTextBrowser["B"]),Qt::UserRole);


        ////////////////////////////////////////
        ///////////////////////////////////////////
 

   tempIdx = top1Idx;
   mdl->insertRow(0,tempIdx);
   QModelIndex currentParentIdx = tempIdx = mdl->index(0,0,tempIdx);
   mdl->setData(tempIdx,"C");
   mdl->setData(tempIdx,m_stacked->addWidget(mapWidgetNameToTextBrowser["C"]),Qt::UserRole);

   //mdl->insertRow(0,currentParentIdx);
   tempIdx = mdl->index(0,0,currentParentIdx);
   mdl->setData(tempIdx,"D");
   mdl->setData(tempIdx,m_stacked->addWidget(mapWidgetNameToTextBrowser["D"]),Qt::UserRole);

A
----C
-------D
----------- ---------------> extra row
B

[VRonin]

It's not clear from the drawing who's the parent of the extra row