diff --git a/AABB_tree/demo/AABB_tree/Scene.cpp b/AABB_tree/demo/AABB_tree/Scene.cpp
index c0480d3fa42..c9efc60a573 100644
--- a/AABB_tree/demo/AABB_tree/Scene.cpp
+++ b/AABB_tree/demo/AABB_tree/Scene.cpp
@@ -46,8 +46,6 @@ Scene::Scene()
     m_max_distance_function = (FT)0.0;
     texture = new Texture(m_grid_size,m_grid_size);
     are_buffers_initialized = false;
-    context_initialized = false;
-
 
 }
 
@@ -590,13 +588,7 @@ void Scene::update_bbox()
 }
 
 void Scene::draw(QGLViewer* viewer)
-{
-    if(!context_initialized)
-    {
-        initializeOpenGLFunctions();
-        glGenTextures(1, &textureId);
-        context_initialized = true;
-    }
+{       
     if(!are_buffers_initialized)
         initialize_buffers();
     QColor color;
@@ -1317,3 +1309,9 @@ void Scene::deactivate_cutting_plane()
     disconnect(m_frame, SIGNAL(modified()), this, SLOT(cutting_plane()));
     m_view_plane = false;
 }
+void Scene::initGL()
+{
+    initializeOpenGLFunctions();
+    glGenTextures(1, &textureId);
+    compile_shaders();
+}
diff --git a/AABB_tree/demo/AABB_tree/Scene.h b/AABB_tree/demo/AABB_tree/Scene.h
index 00858d167a9..0e6616c3fab 100644
--- a/AABB_tree/demo/AABB_tree/Scene.h
+++ b/AABB_tree/demo/AABB_tree/Scene.h
@@ -81,6 +81,7 @@ public:
     void update_bbox();
     Bbox bbox() { return m_bbox; }
     ManipulatedFrame* manipulatedFrame() const { return m_frame; }
+    void initGL();
 
 private:
     // member data
@@ -110,7 +111,6 @@ private:
     
     Cut_planes_types m_cut_plane;
     bool are_buffers_initialized;
-    bool context_initialized;
   
 private:
     // utility functions
@@ -167,6 +167,7 @@ private:
     void initialize_buffers();
     void compute_elements(int mode);
     void attrib_buffers(QGLViewer*);
+    void compile_shaders();
     void compute_texture(int, int, Color_ramp, Color_ramp);
 
 public:
@@ -250,7 +251,6 @@ public slots:
     // cutting plane
     void cutting_plane();
     void changed();
-    void compile_shaders();
 }; // end class Scene
 
 #endif // SCENE_H
diff --git a/AABB_tree/demo/AABB_tree/Viewer.cpp b/AABB_tree/demo/AABB_tree/Viewer.cpp
index 22c1a8981ac..7a72edb85df 100644
--- a/AABB_tree/demo/AABB_tree/Viewer.cpp
+++ b/AABB_tree/demo/AABB_tree/Viewer.cpp
@@ -31,7 +31,7 @@ void Viewer::initializeGL()
   QGLViewer::initializeGL();
   setBackgroundColor(::Qt::white);
   m_pScene->context = this->context();
-  m_pScene->compile_shaders();
+  m_pScene->initGL();
 }
 
 void Viewer::mousePressEvent(QMouseEvent* e)