diff --git a/include/widget.h b/include/widget.h
index 4518ec1..24a4b17 100644
--- a/include/widget.h
+++ b/include/widget.h
@@ -40,10 +40,6 @@
 
 void widget_create_windows (GtkApplication *app);
 
-void widget_create_main_window (GtkApplication *app);
-void widget_create_dialog_window (GtkApplication *app);
-void widget_create_text_window (GtkApplication *app);
-
 void widget_topbar_design_main_window (GtkWindow *main_window);
 void widget_topbar_design_dialog_window (GtkWindow *main_window,
                                          GtkWindow *dialog_window);
diff --git a/src/main.c b/src/main.c
index 9e29db9..2c46181 100644
--- a/src/main.c
+++ b/src/main.c
@@ -146,7 +146,6 @@ int main (int argc, char **argv)
     app = gtk_application_new ("org.gem-graph", G_APPLICATION_DEFAULT_FLAGS);
 
     g_signal_connect (app, "activate", G_CALLBACK (on_windows_activation), NULL);
-    if (0) widget_create_windows (app);  //  <  Erreur de segmentation
 
     status = g_application_run (G_APPLICATION (app), argc, argv);
     g_object_unref (app);
diff --git a/src/signal.c b/src/signal.c
index bc8739a..06ce91c 100644
--- a/src/signal.c
+++ b/src/signal.c
@@ -56,23 +56,6 @@ static void on_auto_notification (const char *message)
 }
 
 
-
-void on_windows_activation (GtkApplication *app,
-                            gpointer no_user_data)
-{
-  widget_create_main_window (app);
-  widget_topbar_design_main_window (GTK_WINDOW (widget_topbar_get_main_window ()));
-
-  widget_create_dialog_window (app);
-  widget_topbar_design_dialog_window (GTK_WINDOW (widget_topbar_get_main_window ()),
-                                      GTK_WINDOW (widget_topbar_get_dialog_window()));
-
-  widget_create_text_window (app);
-  widget_topbar_design_text_window (GTK_WINDOW (widget_topbar_get_main_window ()),
-                                    GTK_WINDOW (widget_topbar_get_text_window()));
-}
-
-
 /******************************************************************************/
 /*                                T R E E                                     */
 /******************************************************************************/
diff --git a/src/widget/init.c b/src/widget/init.c
index 512f78f..14beadf 100644
--- a/src/widget/init.c
+++ b/src/widget/init.c
@@ -42,8 +42,11 @@ void *widget_topbar_get_main_window()   { return main_window;   }
 void *widget_topbar_get_dialog_window() { return dialog_window; }
 void *widget_topbar_get_text_window()   { return text_window;   }
 
-void widget_create_windows (GtkApplication *app)
+void on_windows_activation (GtkApplication *app)
 {
+//  g_application_activate (G_APPLICATION (app));   <   how ?   >   in main.c is
+//  g_signal_connect (app, "activate", G_CALLBACK (on_windows_activation), NULL);
+
     main_window   = GTK_WINDOW (gtk_application_window_new (app));
     dialog_window = GTK_WINDOW (gtk_application_window_new (app));
     text_window   = GTK_WINDOW (gtk_application_window_new (app));
@@ -53,13 +56,3 @@ void widget_create_windows (GtkApplication *app)
     widget_topbar_design_text_window   (main_window, text_window);
 }
 
-void widget_create_main_window (GtkApplication *app)
-{ main_window   = GTK_WINDOW (gtk_application_window_new (app)); }
-
-void widget_create_dialog_window (GtkApplication *app)
-{ dialog_window = GTK_WINDOW (gtk_application_window_new (app)); }
-
-void widget_create_text_window (GtkApplication *app)
-{ text_window   = GTK_WINDOW (gtk_application_window_new (app)); }
-
-
diff --git a/src/widget/state.c b/src/widget/state.c
index dd954ce..a31bcca 100644
--- a/src/widget/state.c
+++ b/src/widget/state.c
@@ -67,7 +67,8 @@ static GtkBox *rec_XYZ_box()
   gtk_box_append (XYZ_scrollbar_box, scroll_Z);
   gtk_box_append (XYZ_scrollbar_box, GTK_WIDGET (gtk_label_new ("  ")));  //  AD HOC (pour "centrer")
 
-  GtkWidget *btt_reset = gtk_toggle_button_new_with_label ("reset");
+    GtkWidget *btt_reset = gtk_toggle_button_new ();
+    gtk_button_set_icon_name (GTK_BUTTON (btt_reset), "view-refresh-symbolic");
   gtk_box_append (XYZ_labels_box, GTK_WIDGET (gtk_label_new ("\nX Y Z")));
   gtk_box_append (XYZ_labels_box, GTK_WIDGET (XYZ_scrollbar_box));
   gtk_box_append (XYZ_labels_box, GTK_WIDGET (btt_reset));
diff --git a/src/widget/topbar.c b/src/widget/topbar.c
index 7a9ff77..79d9429 100644
--- a/src/widget/topbar.c
+++ b/src/widget/topbar.c
@@ -110,6 +110,7 @@ static GtkWidget *window_header_bar (GtkWindow *window);
 static void window_header_bar_left (GtkWidget *header_bar);
 static void window_header_bar_right (GtkWidget *header_bar);
 
+
 void widget_topbar_design_main_window (GtkWindow *main_window)
 {
   GtkWidget *header_bar = window_header_bar (main_window);
@@ -120,6 +121,7 @@ void widget_topbar_design_main_window (GtkWindow *main_window)
   gtk_window_present (GTK_WINDOW (main_window));
 }
 
+
 static GtkWidget *window_header_bar (GtkWindow *window)
 {
   char *title = "E coli   (with permission from David S. Goodsell, 2009)";