Ok but you did it with Designer. In my case, I can't... Here's all my code for this part, do you see any mistakes? Would you have done it differently?
Qt Code: 
  1. //my .h file
  2. QVBoxLayout* layout;
  3. QTextEdit* txt;
  4. QWidget* container;
  5.  
  6. //my .cpp file
  7.   //Constructor
  8.   	container = new QWidget();
  9. 	layout = new QVBoxLayout();
  10. 	ui.scrollArea->setWidget(container);
  11. 	container->setLayout(layout);
  12. 	ui.scrollArea->setLayout(layout);
  13. 	ui.scrollArea->setWidgetResizable(true);
  14.  
  15.   //Slot which creates my textEdits
  16. 	txt = new QTextEdit();
  17. 	txt->setParent(container);
  18. 	connect(txt->document(), SIGNAL(contentsChanged()), this, SLOT(update_size()));
  19. 	txt->installEventFilter(this);
  20. 	txt->setFont(QFont("Times New Roman", fontSize));
  21. 	txt->setTextColor(fontColor);
  22. 	txt->show();
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