diff --git a/(notes) b/(notes)
index 88aa212..ed15988 100644
--- a/(notes)
+++ b/(notes)
@@ -4,14 +4,6 @@ contain.c:  (136)  gtk_box_append (middle_box, GTK_WIDGET (get_GLArea()));
 
 graph_area.h:  (177)  static inline GLuint create_shader(const int stack_id, int type, const char *src) {...}
 
-graph_area.h://////////////////////////    shader = glCreateShader(type);
-graph_area.h://////////////////////////    glShaderSource(shader, 1, &src, NULL);
-graph_area.h://////////////////////////    glCompileShader(shader);
-graph_area.h://////////////////////////    glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
-graph_area.h://////////////////////////        glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_len);
-graph_area.h://////////////////////////        glGetShaderInfoLog(shader, log_len, NULL, buffer);
-graph_area.h://////////////////////////        glDeleteShader(shader);
-
 
 graph_area.c://////////////////////////           stack_index[i].stack_id = graphics_init(&error_buffer);
 graph_area.c://////////////////////////            if (graphics_shutdown(stack_index[i].stack_id,
@@ -33,6 +25,7 @@ graph_area.c://////////////////////////                     G_CALLBACK(on_glarea
 graph_area.c://////////////////////////    g_signal_connect(gl_area,
 graph_area.c://////////////////////////                     "unrealize",
 graph_area.c://////////////////////////                     G_CALLBACK(on_glarea_unrealize), NULL);
+
 graph_stack.c://////////////////////////    glEnable(GL_DEBUG_OUTPUT);
 graph_stack.c://////////////////////////    glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
 graph_stack.c://////////////////////////    glEnable(GL_MULTISAMPLE);
@@ -64,6 +57,7 @@ graph_stack.c://////////////////////////                               arrow.z);
 graph_stack.c://////////////////////////    }
 graph_stack.c://////////////////////////    if (stack->arrows_nb != announced_arrows_nb)
 graph_stack.c://////////////////////////        g_printerr("ARGH : all the arrows have not been parsed !\n");
+
 init.c.todo://////////////////////////    vertex = create_shader(stack_id, GL_VERTEX_SHADER, vertex_shader);
 init.c.todo://////////////////////////    fragment = create_shader(stack_id, GL_FRAGMENT_SHADER, fragment_shader);
 --------------------------------------------------------------------------------
diff --git a/graph_area.c b/graph_area.c
index bd894c3..fb4cdc6 100644
--- a/graph_area.c
+++ b/graph_area.c
@@ -93,7 +93,7 @@ bool ui_init_graphic_stack(void *container_widget, GError *error_buffer)
         //g_printerr("[debug]     ui_init_graphic_stack() : target would be %p\n",
                    //stack_index[i].container_widget);
         if (stack_index[i].container_widget == (void *)container_widget) {
-//////////////////////////           stack_index[i].stack_id = graphics_init(&error_buffer);
+           stack_index[i].stack_id = graphics_init(&error_buffer);
             //g_printerr("[debug] ui_init_graphic_stack() : stack_id is %d\n",
                        //stack_index[i].stack_id);
             if (stack_index[i].stack_id >= 0)
@@ -117,10 +117,10 @@ bool ui_shutdown_graphic_stack(void *container_widget, GError *error_buffer)
     // look for stack_index entry
     for (int i = 0; i < stack_index_size; i++) {
         if (stack_index[i].container_widget == (void *)container_widget) {
-//////////////////////////            if (graphics_shutdown(stack_index[i].stack_id,
-//////////////////////////                                  &error_buffer) == false) {
-//////////////////////////                return false;
-//////////////////////////            }
+            if (graphics_shutdown(stack_index[i].stack_id,
+                                  &error_buffer) == false) {
+                return false;
+            }
             stack_index[i].stack_id = 0;
             return true;
         }
@@ -150,7 +150,7 @@ bool ui_render_stack(GtkWidget *container_widget)
     // look for stack_index entry
     for (int i = 0; i < stack_index_size; i++) {
         if (stack_index[i].container_widget == (void *)container_widget) {
-//////////////////////////            graphics_draw(stack_index[i].stack_id);
+//////////////////////////            graphics_draw (stack_index[i].stack_id);
             return true;
         }
     }
@@ -169,7 +169,7 @@ bool ui_update_axis_stack(GtkWidget *container_widget, int axis, int value)
     // look for stack_index entry
     for (int i = 0; i < stack_index_size; i++) {
         if (stack_index[i].container_widget == (void *)container_widget) {
-//////////////////////////            graphic_stack[stack_index[i].stack_id].rotation_angles[axis] = value;
+            graphic_stack[stack_index[i].stack_id].rotation_angles[axis] = value;
             gtk_widget_queue_draw((GtkWidget*)(stack_index[i].gl_area));
             return true;
         }
@@ -188,7 +188,7 @@ void ui_shutdown_all_graphic_stacks(void)
 {
     // look for stack_index entry
     for (int i = 0; i < stack_index_size; i++) {
-//////////////////////////        graphics_shutdown(stack_index[i].stack_id, NULL);
+        graphics_shutdown(stack_index[i].stack_id, NULL);
     }
     return;
 }
@@ -230,9 +230,7 @@ GtkWidget *create_axis_slider(int axis)
     gtk_widget_set_visible (label, TRUE);
 
     adj = gtk_adjustment_new(0.0, 0.0, 360.0, 1.0, 12.0, 0.0);
-//////////////////////////    g_signal_connect(adj, "value-changed",
-//////////////////////////                                        G_CALLBACK(on_axis_value_change),
-//////////////////////////                                        (gpointer) label);
+//////////////////////////    g_signal_connect (adj, "value-changed", G_CALLBACK(on_axis_value_change), (gpointer) label);
     slider = gtk_scale_new(GTK_ORIENTATION_HORIZONTAL, adj);
     gtk_box_append(GTK_BOX(box), slider);
     gtk_widget_set_hexpand(slider, TRUE);
@@ -288,17 +286,9 @@ bool ui_setup_glarea(int target_mode, GtkWidget *target_widget)
     //gtk_widget_set_valign(gl_area, GTK_ALIGN_CENTER);
 
     // The main "draw" call for GtkGLArea
-//////////////////////////    g_signal_connect(GTK_GL_AREA(gl_area),
-//////////////////////////                     "render",
-//////////////////////////                     G_CALLBACK(on_glarea_render), NULL);
-
-//////////////////////////    g_signal_connect(gl_area,
-//////////////////////////                     "realize",
-//////////////////////////                     G_CALLBACK(on_glarea_realize), NULL);
-
-//////////////////////////    g_signal_connect(gl_area,
-//////////////////////////                     "unrealize",
-//////////////////////////                     G_CALLBACK(on_glarea_unrealize), NULL);
+//////////////////////////    g_signal_connect(GTK_GL_AREA(gl_area), "render", G_CALLBACK(on_glarea_render), NULL);
+//////////////////////////    g_signal_connect(gl_area, "realize", G_CALLBACK(on_glarea_realize), NULL);
+//////////////////////////    g_signal_connect(gl_area, "unrealize", G_CALLBACK(on_glarea_unrealize), NULL);
 
     stack_index[stack_index_size-1].container_widget =
         (void*)target_widget;