diff --git a/AABB_tree/demo/AABB_tree/CMakeLists.txt b/AABB_tree/demo/AABB_tree/CMakeLists.txt
index 76e9faa655e..d3042f8eb7c 100644
--- a/AABB_tree/demo/AABB_tree/CMakeLists.txt
+++ b/AABB_tree/demo/AABB_tree/CMakeLists.txt
@@ -24,7 +24,7 @@ include_directories(BEFORE ./ ./include)
 find_package(CGAL REQUIRED OPTIONAL_COMPONENTS Qt6)
 
 # Find Qt6 itself
-find_package(Qt6 QUIET COMPONENTS  OpenGLWidgets Gui Svg)
+find_package(Qt6 QUIET COMPONENTS  OpenGLWidgets Gui Svg Qml)
 
 if(CGAL_Qt6_FOUND AND Qt6_FOUND)
 
@@ -53,7 +53,7 @@ if(CGAL_Qt6_FOUND AND Qt6_FOUND)
     #${CGAL_Qt6_MOC_FILES}
   )
   # Link with Qt libraries
-  target_link_libraries(AABB_demo PRIVATE Qt6::OpenGLWidgets Qt6::Gui
+  target_link_libraries(AABB_demo PRIVATE Qt6::OpenGLWidgets Qt6::Gui Qt6::Qml
                                           CGAL::CGAL CGAL::CGAL_Qt6)
 
   add_to_cached_list(CGAL_EXECUTABLE_TARGETS AABB_demo)
diff --git a/AABB_tree/demo/AABB_tree/MainWindow.cpp b/AABB_tree/demo/AABB_tree/MainWindow.cpp
index 95fc4056bf7..7064d50ba5a 100644
--- a/AABB_tree/demo/AABB_tree/MainWindow.cpp
+++ b/AABB_tree/demo/AABB_tree/MainWindow.cpp
@@ -13,6 +13,8 @@
 
 #include "ui_MainWindow.h"
 
+
+
 MainWindow::MainWindow(QWidget* parent)
 : CGAL::Qt::DemosMainWindow(parent)
 {
@@ -38,12 +40,25 @@ MainWindow::MainWindow(QWidget* parent)
   connect(this, SIGNAL(openRecentFile(QString)),
     this, SLOT(open(QString)));
 
+  QJSValue mainWindow = myEngine.newQObject(this);
+  myEngine.globalObject().setProperty("main_window", mainWindow);
   readSettings();
+  std::ifstream script("init.js");
+  if(script.good()){
+    std::string line;
+    while(getline(script, line)){
+      myEngine.evaluate(line.c_str());
+    }
+  }
 }
 
 MainWindow::~MainWindow()
 {
   m_pViewer->makeCurrent();
+  // AF I thought this helps to avoid  the exception when the program
+  // terminates, but it does not
+  myEngine.globalObject().setProperty("main_window", QJSValue());
+  myEngine.collectGarbage();
   delete ui;
 }
 
@@ -65,6 +80,13 @@ void MainWindow::dropEvent(QDropEvent *event)
   event->acceptProposedAction();
 }
 
+
+void MainWindow::hello() const
+{
+  std::cout << "Hhello world" << std::endl;
+}
+
+
 void MainWindow::updateViewerBBox()
 {
   m_pScene->update_bbox();
@@ -418,7 +440,3 @@ void MainWindow::on_actionCopy_snapshot_triggered()
   qb->setImage(snapshot);
   QApplication::restoreOverrideCursor();
 }
-
-
-
-
diff --git a/AABB_tree/demo/AABB_tree/MainWindow.h b/AABB_tree/demo/AABB_tree/MainWindow.h
index f768694514b..7a28f7cde91 100644
--- a/AABB_tree/demo/AABB_tree/MainWindow.h
+++ b/AABB_tree/demo/AABB_tree/MainWindow.h
@@ -2,6 +2,7 @@
 #define MAINWINDOW_H
 
 #include <QOpenGLWidget>
+#include <QJSEngine>
 #include <CGAL/Qt/DemosMainWindow.h>
 
 class QDragEnterEvent;
@@ -12,6 +13,36 @@ namespace Ui {
   class MainWindow;
 }
 
+#if 0
+
+struct Foo : public QObject
+{
+
+  Q_OBJECT
+public:
+  QJSEngine myEngine;
+
+  Foo()
+  {
+      QJSValue baz = myEngine.newQObject(this);
+      myEngine.globalObject().setProperty("baz", baz);
+  }
+
+  void bar()
+  {
+      std::cout << "bar()" << std::endl;
+      myEngine.evaluate("baz.hello()");
+  }
+
+public slots:
+  void hello() const // if not a slot it must be
+  {
+    std::cout << "called hello()" << std::endl;
+  }
+
+};
+#endif
+
 
 class MainWindow :
   public CGAL::Qt::DemosMainWindow
@@ -22,6 +53,8 @@ public:
   ~MainWindow();
 
   public slots:
+
+    void hello() const;
     void updateViewerBBox();
     void open(QString filename);
     void setAddKeyFrameKeyboardModifiers(Qt::KeyboardModifiers);
@@ -79,6 +112,7 @@ public:
       void on_actionView_cutting_plane_triggered();
 
 private:
+  QJSEngine myEngine;
   Scene* m_pScene;
   Viewer* m_pViewer;
   Ui::MainWindow* ui;