--- /Users/gabi/Work/dev/qt5-5.6/qtbase/examples/opengl/hellogl2/window.cpp	2015-11-24 16:37:22.000000000 -0800
+++ window.cpp	2016-05-05 18:05:49.000000000 -0700
@@ -49,6 +49,7 @@
 #include <QDesktopWidget>
 #include <QApplication>
 #include <QMessageBox>
+#include <QSplitter>
 
 Window::Window(MainWindow *mw)
     : mainWindow(mw)
@@ -58,6 +59,7 @@
     xSlider = createSlider();
     ySlider = createSlider();
     zSlider = createSlider();
+    xSlider->winId(); // BAHM!
 
     connect(xSlider, &QSlider::valueChanged, glWidget, &GLWidget::setXRotation);
     connect(glWidget, &GLWidget::xRotationChanged, xSlider, &QSlider::setValue);
@@ -66,16 +68,19 @@
     connect(zSlider, &QSlider::valueChanged, glWidget, &GLWidget::setZRotation);
     connect(glWidget, &GLWidget::zRotationChanged, zSlider, &QSlider::setValue);
 
-    QVBoxLayout *mainLayout = new QVBoxLayout;
     QHBoxLayout *container = new QHBoxLayout;
-    container->addWidget(glWidget);
+    QWidget *w = new QWidget;
+    w->setLayout(container);
     container->addWidget(xSlider);
     container->addWidget(ySlider);
     container->addWidget(zSlider);
 
-    QWidget *w = new QWidget;
-    w->setLayout(container);
-    mainLayout->addWidget(w);
+    QSplitter *splitter = new QSplitter(Qt::Horizontal);
+    splitter->addWidget(glWidget);
+    splitter->addWidget(w);
+
+    QVBoxLayout *mainLayout = new QVBoxLayout;
+    mainLayout->addWidget(splitter);
     dockBtn = new QPushButton(tr("Undock"), this);
     connect(dockBtn, &QPushButton::clicked, this, &Window::dockUndock);
     mainLayout->addWidget(dockBtn);