diff --git a/Polyhedron/demo/Polyhedron/Scene_c3t3_item.cpp b/Polyhedron/demo/Polyhedron/Scene_c3t3_item.cpp
index eaede41f713..629978405d2 100644
--- a/Polyhedron/demo/Polyhedron/Scene_c3t3_item.cpp
+++ b/Polyhedron/demo/Polyhedron/Scene_c3t3_item.cpp
@@ -390,7 +390,6 @@ struct Set_show_tetrahedra {
   Scene_c3t3_item_priv* priv;
   Set_show_tetrahedra(Scene_c3t3_item_priv* priv) : priv(priv) {}
   void operator()(bool b) {
-    qDebug()<<"coucou";
     priv->show_tetrahedra = b;
     priv->item->show_intersection(b);
   }
@@ -1484,23 +1483,13 @@ Scene_c3t3_item::setColor(QColor c)
 void Scene_c3t3_item::show_grid(bool b)
 {
   d->is_grid_shown = b;
-  Q_FOREACH(QAction* action, contextMenu()->actions())
-    if(action->objectName() == "actionShowGrid")
-    {
-      action->setChecked(b);
-      break;
-    }
+  contextMenu()->findChild<QAction*>("actionShowGrid")->setChecked(b);
   itemChanged();
 }
 void Scene_c3t3_item::show_spheres(bool b)
 {
   d->spheres_are_shown = b;
-  Q_FOREACH(QAction* action, contextMenu()->actions())
-    if(action->objectName() == "actionShowSpheres")
-    {
-      action->setChecked(b);
-      break;
-    }
+  contextMenu()->findChild<QAction*>("actionShowSpheres")->setChecked(b);
   if(b && !d->spheres)
   {
     d->spheres = new Scene_spheres_item(this, true);
@@ -1522,12 +1511,7 @@ void Scene_c3t3_item::show_spheres(bool b)
 }
 void Scene_c3t3_item::show_intersection(bool b)
 {
-  Q_FOREACH(QAction* action, contextMenu()->actions())
-    if(action->objectName() == "actionShowTets")
-    {
-      action->setChecked(b);
-      break;
-    }
+      contextMenu()->findChild<QAction*>("actionShowTets")->setChecked(b);
   if(b && !d->intersection)
   {
     d->intersection = new Scene_intersection_item(this);
@@ -1554,12 +1538,7 @@ void Scene_c3t3_item::show_intersection(bool b)
 void Scene_c3t3_item::show_cnc(bool b)
 {
   d->cnc_are_shown = b;
-  Q_FOREACH(QAction* action, contextMenu()->actions())
-    if(action->objectName() == "actionShowCNC")
-    {
-      action->setChecked(b);
-      break;
-    }
+  contextMenu()->findChild<QAction*>("actionShowCNC")->setChecked(b);
   Q_EMIT redraw();
 
 }
@@ -1587,7 +1566,7 @@ bool Scene_c3t3_item::has_grid()const { return d->is_grid_shown;}
 
 bool Scene_c3t3_item::has_cnc()const { return d->cnc_are_shown;}
 
-bool Scene_c3t3_item::has_tets()const { if(d->intersection) return true; else return false; }
+bool Scene_c3t3_item::has_tets()const { return d->intersection; }
 
 void Scene_c3t3_item::setNormal(float x, float y, float z) {
   d->frame->setOrientation(x, y, z, 0.f);
@@ -1601,18 +1580,12 @@ void Scene_c3t3_item::copyProperties(Scene_item *item)
   d->frame->setPositionAndOrientation(c3t3_item->manipulatedFrame()->position(),
                                       c3t3_item->manipulatedFrame()->orientation());
 
-  if(c3t3_item->has_tets())
-    show_intersection(true);
+  show_intersection(c3t3_item->has_tets());
 
-  if(c3t3_item->has_spheres())
-    show_spheres(true);
+  show_spheres(c3t3_item->has_spheres());
 
-
-  if(c3t3_item->has_cnc())
-    show_cnc(true);
+  show_cnc(c3t3_item->has_cnc());
 
   show_grid(c3t3_item->has_grid());
-
-
 }
 #include "Scene_c3t3_item.moc"
diff --git a/Three/include/CGAL/Three/Scene_item_with_properties.h b/Three/include/CGAL/Three/Scene_item_with_properties.h
index af708294799..20c841ac56b 100644
--- a/Three/include/CGAL/Three/Scene_item_with_properties.h
+++ b/Three/include/CGAL/Three/Scene_item_with_properties.h
@@ -29,7 +29,7 @@ class Scene_item_with_properties {
 public:
   virtual ~Scene_item_with_properties(){}
  //!Copies properties from another Scene_item
- virtual void copyProperties(Scene_item*){}
+ virtual void copyProperties(Scene_item*)=0; //pure virtual method
 };
 }
 }