Add HMI in QScrollArea, but ScrollArea won't scroll - c++

Question

in my project, I have a QScrollArea in a QTabWidget , in this QTabWidget i had few IHM. I would like to put two IHM per line, and when you arrive at the end of QTabWidget , the scrollbar scroll .
This is my class diagram :
My code in MainWindow where i created the QScrollBar :
//Here I create the QScrollArea
QScrollArea *scrollArea = new QScrollArea();
scrollArea->setWidgetResizable(true);
scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
//I had the QScrollBar in the Tab of my QTabWidget
ui->tabWidget->addTab(scrollArea,"Plateau " + ControleSpecial.at(i).toElement().attribute("ID"));
//I call my class Plateau (i'm french ^^)
Plateau *plt = new Plateau(ui->tabWidget);
plt->Rajouter(ControleSpecial.at(i),scrollArea,ui->InfoPlt,column,row);
this->nPlateau.append(plt);
My class Analyse , where i had this IHM :
the code :
{
//I create the layout and ScrollWidget
QGridLayout *layout = new QGridLayout;
QWidget *scrollwidget = new QWidget;
int row = 0;
int column = 0;
QDomNode Analyse;
for(int i=1;i<plateau.childNodes().count()+1;++i)
{
Analyse = plateau.childNodes().at(i-1);
QString nomAnalyse = Analyse.toElement().attribute("Type");
vTypeAnalyse.append(nomAnalyse);
if(nomAnalyse == "Traction_Perpendiculaire")
{
Traction_Perpendiculaire* TP = new Traction_Perpendiculaire();
QGroupBox* analyse = TP->recuperationAnalyse();
//I add the analyse IHM in the layout
layout->addWidget(TP,row,column);
//I don't think my problem it's here
vButtonAnalyse.append(TP->recuperationButton());
connect(vButtonAnalyse[vButtonAnalyse.size()-1],SIGNAL(clicked()),this,SLOT(Recuperation()));
vButtonAnalyse[vButtonAnalyse.size()-1]->setAccessibleName(QString::number(i-1));
Eprouvette *blocEprouvette = new Eprouvette(analyse);
this->vbloceprouvette.append(blocEprouvette);
blocEprouvette->Rajouter(Analyse);
}
if(i%2 == 0)
{
column = 0;
row += 1;
}
else
{
column += 1;
}
}
//And I had the layout in scrollWidget and ScrollWidget in scrollArea
scrollwidget->setLayout(layout);
scrollArea->setWidget(scrollwidget);
//tab->widget(index)
}
And i obtain that:
So if you have any ideas , any ideas would be well come.
Thank you in advance. (sorry for my bad english)

Answer 1

Ok so , when i had the HMI in the layout it's don't work but when i had the QGroupBox it's work. So i resolve it like this :
layout->addWidget(TP,row,column);
//to :
layout->addWidget(TP->MyGroupBox(),row,column);