diff --git a/Polyhedron/demo/Polyhedron/Polyhedron_demo_remeshing_plugin.cpp b/Polyhedron/demo/Polyhedron/Polyhedron_demo_remeshing_plugin.cpp
index 51eb095efce..545dfca8395 100644
--- a/Polyhedron/demo/Polyhedron/Polyhedron_demo_remeshing_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Polyhedron_demo_remeshing_plugin.cpp
@@ -6,6 +6,8 @@
 #include <QObject>
 #include <QAction>
 #include <QMainWindow>
+#include <QAction>
+#include <QMenu>
 #include <QApplication>
 #include <QtPlugin>
 #include "Scene_polyhedron_item.h"
@@ -35,6 +37,18 @@ public:
       connect(actionRemeshing, SIGNAL(triggered()),
               this, SLOT(remesh()));
     }
+    actionShowSpheres = new QAction("Show protecting spheres", mw);
+    actionShowSpheres->setCheckable(true);
+    actionShowSpheres->setChecked(false);
+    QMenu* menuView = mw->findChild<QMenu*>("menuView");
+    if(menuView)
+    {
+      menuView->addAction(actionShowSpheres);
+    }
+    else {
+      std::cerr << "Error: cannot find menu \"menuView\" in QMainWindow \"" 
+                << qPrintable(mw->objectName()) << "\"!\n";
+    }
   }
 
   QList<QAction*> actions() const {
@@ -45,6 +59,7 @@ public slots:
 
 private:
   QAction* actionRemeshing;
+  QAction* actionShowSpheres;
 }; // end class Polyhedron_demo_remeshing_plugin
 
 void Polyhedron_demo_remeshing_plugin::remesh()
@@ -128,6 +143,14 @@ void Polyhedron_demo_remeshing_plugin::remesh()
       new_item->setRenderingMode(item->renderingMode());
       item->setVisible(false);
       scene->itemChanged(index);
+      QObject::connect(actionShowSpheres, SIGNAL(toggled(bool)),
+                       new_item, SLOT(show_spheres(bool)));
+      // meta-call, to avoid the inclusing of the CGAL headers
+      QMetaObject::invokeMethod(new_item,
+                                "show_spheres",
+                                Qt::DirectConnection,
+                                Q_ARG(bool, actionShowSpheres->isChecked()));
+
       scene->addItem(new_item);
     }
 
diff --git a/Polyhedron/demo/Polyhedron/Polyhedron_demo_remeshing_plugin_cgal_code.cpp b/Polyhedron/demo/Polyhedron/Polyhedron_demo_remeshing_plugin_cgal_code.cpp
index 2312d9ad006..aafc192ebb5 100644
--- a/Polyhedron/demo/Polyhedron/Polyhedron_demo_remeshing_plugin_cgal_code.cpp
+++ b/Polyhedron/demo/Polyhedron/Polyhedron_demo_remeshing_plugin_cgal_code.cpp
@@ -320,8 +320,14 @@ public:
       draw_triangle(pa, pb, pc);
     }
     ::glEnd();
+    
+    GLenum gl_error = ::glGetError();
+    if(gl_error != GL_NO_ERROR)
+      std::cerr << "GL error: " << gluErrorString(gl_error) << std::endl;
+
+    if(!draw_spheres)
+      return;
 
-    return;
     // force wireframe for protecting spheres
     GLint polygon_mode[2];
     ::glGetIntegerv(GL_POLYGON_MODE, &polygon_mode[0]);
@@ -365,6 +371,11 @@ public:
     }
   }
 
+public slots:
+  void show_spheres(bool b) {
+    draw_spheres = b;
+  }
+
 private:
   static void draw_triangle(const Tr::Point& pa,
                             const Tr::Point& pb,
@@ -383,6 +394,7 @@ private:
   mutable GLuint sphere_display_list;
   mutable GLUquadric* quadric;
   C2t3 c2t3_;
+  bool draw_spheres;
 };
 
 typedef Tr::Geom_traits GT;