Wrong display with foreign widget with QWidget::createWindowContainer()

	// Create the independent window -------------------------------
	QWidget* widget = new QWidget();
	widget->setWindowTitle(MY_TITLE);
	widget->setAttribute( Qt::WA_DeleteOnClose );
	widget->setAttribute(Qt::WA_NativeWindow, true);
	widget->setAttribute(Qt::WA_NoSystemBackground, true);
	widget->setAutoFillBackground(false);

	QVBoxLayout *verticalLayout( new QVBoxLayout(widget) );

	QComboBox* combo = new QComboBox(widget);
	combo->addItem("Combobox create outside this app - 1");
	combo->addItem("Combobox create outside this app - 2");
	verticalLayout->addWidget(combo);

	widget->show();

	// Find the independent window -------------------------------
	TCHAR* tTitle = (TCHAR*)MY_TITLE.utf16();
	WId myWidgetId = (WId)::FindWindow(0, tTitle);
	//------------------------------------------------------------

	QWindow* window = QWindow::fromWinId(myWidgetId);
	QWidget* container = QWidget::createWindowContainer(window);
	container->setFocusPolicy(Qt::TabFocus);
	container->setMinimumSize(100,50);
	ui->verticalLayout->addWidget(container);