diff --git a/tests/manual/qopenglwidget/openglwidget/main.cpp b/tests/manual/qopenglwidget/openglwidget/main.cpp
index 3844ca3d0f..deb555019f 100644
--- a/tests/manual/qopenglwidget/openglwidget/main.cpp
+++ b/tests/manual/qopenglwidget/openglwidget/main.cpp
@@ -47,6 +47,7 @@
 #include <QTimer>
 #include <QSurfaceFormat>
 #include <QDebug>
+#include <QVBoxLayout>
 #include <private/qwindow_p.h>
 
 class Tools : public QObject
@@ -216,12 +217,28 @@ int main(int argc, char *argv[])
     sw->setObjectName("MDI Sub-Window for tab widget");
     sw->setWindowTitle("Tabs");
 
+    QWidget *secondTLW = new QWidget(nullptr, Qt::Tool);
+    new QVBoxLayout(secondTLW);
+    secondTLW->show();
+
     TabWidgetResetter twr(tw);
     Tools t(&wnd, glw3, QVector<QWidget *>() << glw << glw2 << glw3 << glw4);
     QObject::connect(&t, SIGNAL(aboutToShowGLWidgets()), &twr, SLOT(reset()));
     QMenu *toolsMenu = wnd.menuBar()->addMenu("&Tools");
     toolsMenu->addAction("&Turn widgets (or some parent) into native", &t, SLOT(turnNative()));
     toolsMenu->addAction("&Hide/show all OpenGL widgets", &t, SLOT(hideShowAllGL()));
+    toolsMenu->addAction("Toggle tab widget parent", [tw, sw, secondTLW] {
+        QObject* parent = tw->parent();
+        if (parent == secondTLW)
+        {
+            sw->setWidget(tw);
+        }
+        else
+        {
+            sw->setWidget(nullptr);
+            secondTLW->layout()->addWidget(tw);
+        }
+    });
 
     QTimer compStatusDumpTimer;
     QObject::connect(&compStatusDumpTimer, SIGNAL(timeout()), &t, SLOT(dumpCompositingStatus()));