The cellWidgets in a QTableWidget can not auto-scroll when the QTableWidget was in a QGraphicsScene. But QTableWidgetItem can. It result in the last cellWidgets can not be seen even scrolling the scrollbar.
See the test case below.

#include <QtGui>

int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QGraphicsScene scene;
scene.setSceneRect(0, 0, 400, 200);

QTableWidget *table = new QTableWidget;
table->setColumnCount(2);
table->setRowCount(10);

for (int i=0; i<10; i++)

{ QString str; str.setNum(i); table->setItem(i, 0, new QTableWidgetItem(str)); table->setCellWidget(i, 1, new QPushButton(str)); }

scene.addWidget(table);

QGraphicsView *view = new QGraphicsView(&scene);
view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
view->show();

return app.exec();
}