The code of yours is confusing because an item you call "parent" is actually created as child. However, this should do the trick:
Qt Code: 
  1. bool main::setupTreeView ( QTreeWidget * thetwmTreeWidget )
  2. {
  3.     QList<QTreeWidgetItem *> items;
  4.  
  5.     if ( listtwmConfigPool.size() != 0 )
  6.     {
  7.         for ( int i = 0; i < myObject.size() ; i++ )
  8.         {
  9.             QTreeWidgetItem * tempQTreeWidgetItem = new QTreeWidgetItem ();
  10.             tempQTreeWidgetItem->setText ( 0 , myObject.getName() );
  11.             //tempQTreeWidgetItem->setExpanded( true );
  12.             //qDebug() << tempQTreeWidgetItem->isExpanded(); // it's false...why?
  13.             items.append ( tempQTreeWidgetItem );
  14.  
  15.             for ( int i = 0; i < myObjectParent.size(); i++ )
  16.             {
  17.                 QTreeWidgetItem * tempQTreeWidgetItemParent = new QTreeWidgetItem ( tempQTreeWidgetItem );
  18.                 tempQTreeWidgetItemParent->setText ( 0 , myObjectParent.getName() );
  19.                 //items.append ( tempQTreeWidgetItemParent ); // <--- get rid of this
  20.             }
  21.         }
  22.  
  23.         thetwmTreeWidget->setColumnCount (1);
  24.         thetwmTreeWidget->insertTopLevelItems (0, items);
  25.         thetwmTreeWidget->expandAll(); // <--- add this
  26.     }
  27.     return TRUE;
  28. }
To copy to clipboard, switch view to plain text mode