diff --git a/include/widget.h b/include/widget.h
index f208021..1676dac 100644
--- a/include/widget.h
+++ b/include/widget.h
@@ -77,10 +77,10 @@ void widget_design_text_window   (GtkWindow *main_window, GtkWindow *text_window
 //    called  in widget / topbar / dispatch.c / widget_design_main_window()
 //    defined in topbar / left.c
 
-void *widget_get_btt_synth();   //   {return btt_SYNTH;}
-void *widget_get_btt_state();   //   {return btt_STATE;}
-void *widget_get_btt_rules();   //   {return btt_RULES;}
-void *widget_get_btt_data();    //   {return btt_DATA;}
+const char *widget_get_btt_synth_label();
+const char *widget_get_btt_state_label();
+const char *widget_get_btt_rules_label();
+const char *widget_get_btt_data_label();
 
 //    called  in widget / topbar / dispatch.c / widget_design_main_window()
 //    defined in widget / topbar / left.c
diff --git a/src/signal.c b/src/signal.c
index 33e2991..bfed126 100644
--- a/src/signal.c
+++ b/src/signal.c
@@ -244,13 +244,13 @@ void on_write_current_model (GtkWidget *btt_write_current_model,
 
 
 /******************************************************************************/
-/*                      T O P B A R    W I D G E T S                          */
+/*                 T O P B A R    L E F T    W I D G E T S                    */
 /******************************************************************************/
 
-// -----------------------   E X E C  /  E D I T   -------------------------- //
-
 static void switch_state_rules_data();
 
+// -----------------------   E X E C  /  E D I T   -------------------------- //
+
 void on_toggle_exec_edit (GtkWidget *toggled_button, gpointer user_data)
 {
     fsm_journal_event (INFO, BUTTON, "signal", "toggle exec edit()",
@@ -270,7 +270,7 @@ void on_toggle_exec_edit (GtkWidget *toggled_button, gpointer user_data)
 
         //  https://docs.gtk.org/gtk4/class.Window.html    TODO   2024-06-30
         //  gtk_window_present (GTK_WINDOW (widget_get_dialog_window()));
-        // //   works once only    A window should be created each time
+        // //   works onstrcmpce only    A window should be created each time
 
         fsm_set_exec_edit (EDIT);
         // TODO set_btt_SYNTH_active (FALSE)
@@ -283,6 +283,25 @@ void on_toggle_exec_edit (GtkWidget *toggled_button, gpointer user_data)
 
 // ------------------   S T A T E  /  R U L E S  /  D A T A   --------------- //
 
+void on_toggle_state_rules_data (GtkWidget *toggled_button, gpointer user_data)
+{
+    const char *toggled_button_name
+                = gtk_check_button_get_label  (GTK_CHECK_BUTTON (toggled_button));
+    fsm_journal_event (DEBUG, BUTTON, "signal", "toggle_state_rules_data()",
+        concat ("change of status requested", ":  [", toggled_button_name, "]", NULL));
+    int is_active = gtk_check_button_get_active (GTK_CHECK_BUTTON (toggled_button));
+
+    if ( ! strcmp (toggled_button_name, widget_get_btt_synth_label())) fsm_set_state_rules_data (SYNTH);
+    if ( ! strcmp (toggled_button_name, widget_get_btt_state_label())) fsm_set_state_rules_data (STATE);
+    if ( ! strcmp (toggled_button_name, widget_get_btt_rules_label())) fsm_set_state_rules_data (RULES);
+    if ( ! strcmp (toggled_button_name, widget_get_btt_data_label()))  fsm_set_state_rules_data (DATA);
+
+    if (is_active) switch_state_rules_data();
+}
+
+
+// -----------------------   S T A T I C    S W I T C H   -------------------- //
+
 static void switch_state_rules_data()
 {
     int value = fsm_get_state_rules_data();
@@ -340,32 +359,10 @@ static void switch_state_rules_data()
     }
 }
 
-//  TODO  Il doit y avoir plus élégant,...  ET SURTOUT MOINS DANGEREUX !!!
-// que d'utiliser: strcmp (toggled_button_name, "label_du_bouton")   car:
-// ces labels sont utilisés pour deux fonctions distinctes:
-// (1) ici (just below): pour changer l'état de la fsm
-// et là: src/widget/topbar/left.c:
-//            btt_SYNTH = GTK_BUTTON (gtk_check_button_new_with_label ("synth"));
-// pour changer la page (le widget) affiché
-// IL FAUT REGROUPER CES DEUX FONCTIONS
-
-void on_toggle_state_rules_data (GtkWidget *toggled_button, gpointer user_data)
-{
-    const char *toggled_button_name
-                = gtk_check_button_get_label  (GTK_CHECK_BUTTON (toggled_button));
-    fsm_journal_event (DEBUG, BUTTON, "signal", "toggle_state_rules_data()",
-        concat ("change of status requested", ":  [", toggled_button_name, "]", NULL));
-    int is_active = gtk_check_button_get_active (GTK_CHECK_BUTTON (toggled_button));
-
-    if ( ! strcmp (toggled_button_name, "synth"))   fsm_set_state_rules_data (SYNTH);
-    if ( ! strcmp (toggled_button_name, "state"))   fsm_set_state_rules_data (STATE);
-    if ( ! strcmp (toggled_button_name, "rules"))   fsm_set_state_rules_data (RULES);
-    if ( ! strcmp (toggled_button_name, "results")) fsm_set_state_rules_data (DATA);
-
-    if (is_active) switch_state_rules_data();
-}
-
 
+/******************************************************************************/
+/*                T O P B A R    R I G H T    W I D G E T S                   */
+/******************************************************************************/
 
 // ------------   M E N U  /  S E A R C H  /  H O M E  /  E T C   ----------- //
 
diff --git a/src/widget/topbar/left.c b/src/widget/topbar/left.c
index 4ce3641..df0febf 100644
--- a/src/widget/topbar/left.c
+++ b/src/widget/topbar/left.c
@@ -34,12 +34,17 @@
 /*            M A I N    W I N D O W    T O P B A R    ( L E F T )            */
 /******************************************************************************/
 
+//  ! WARNING !   IL SERAIT DANGEREUX DE REDEFINIR LE LABEL D'UN BOUTON
+//                DANS LE PROGRAMME AILLEURS QU'ICI  (OU PLUS D'UNE FOIS)
+//
+//  par exemple:  grep -r '"synth"'   <   ne doit renvoyer q'UNE SEULE ligne
+
 static GtkButton *btt_SYNTH, *btt_STATE, *btt_RULES, *btt_DATA;
 
-void *widget_get_btt_synth () {return btt_SYNTH;}
-void *widget_get_btt_state () {return btt_STATE;}
-void *widget_get_btt_rules () {return btt_RULES;}
-void *widget_get_btt_data ()  {return btt_DATA;}
+const char *widget_get_btt_synth_label () {return "synth";}
+const char *widget_get_btt_state_label () {return "state";}
+const char *widget_get_btt_rules_label () {return "rules";}
+const char *widget_get_btt_data_label () {return "results";}
 
 void window_design_topbar_left (GtkWidget *header_bar)
 {
@@ -56,20 +61,20 @@ void window_design_topbar_left (GtkWidget *header_bar)
 
     GtkCheckButton *group_state_rules_data = GTK_CHECK_BUTTON (gtk_check_button_new ());
 
-    btt_SYNTH = GTK_BUTTON (gtk_check_button_new_with_label ("synth"));
+    btt_SYNTH = GTK_BUTTON (gtk_check_button_new_with_label (widget_get_btt_synth_label()));
     g_signal_connect (btt_SYNTH, "toggled", G_CALLBACK (on_toggle_state_rules_data), no_local_data);
     gtk_check_button_set_group (GTK_CHECK_BUTTON (btt_SYNTH), group_state_rules_data);
     gtk_check_button_set_active (GTK_CHECK_BUTTON (btt_SYNTH), FALSE);  //  <<  TODO
 
-    btt_STATE = GTK_BUTTON (gtk_check_button_new_with_label ("state"));
+    btt_STATE = GTK_BUTTON (gtk_check_button_new_with_label (widget_get_btt_state_label()));
     g_signal_connect (btt_STATE, "toggled", G_CALLBACK (on_toggle_state_rules_data), no_local_data);
     gtk_check_button_set_group (GTK_CHECK_BUTTON (btt_STATE), group_state_rules_data);
 
-    btt_RULES = GTK_BUTTON (gtk_check_button_new_with_label ("rules"));
+    btt_RULES = GTK_BUTTON (gtk_check_button_new_with_label (widget_get_btt_rules_label()));
     g_signal_connect (btt_RULES, "toggled", G_CALLBACK (on_toggle_state_rules_data), no_local_data);
     gtk_check_button_set_group (GTK_CHECK_BUTTON (btt_RULES), group_state_rules_data);
 
-    btt_DATA  = GTK_BUTTON (gtk_check_button_new_with_label ("results"));
+    btt_DATA  = GTK_BUTTON (gtk_check_button_new_with_label (widget_get_btt_data_label()));
     g_signal_connect (btt_DATA,  "toggled", G_CALLBACK (on_toggle_state_rules_data), no_local_data);
     gtk_check_button_set_group (GTK_CHECK_BUTTON (btt_DATA), group_state_rules_data);
 
@@ -93,12 +98,12 @@ void window_design_topbar_left (GtkWidget *header_bar)
 /*       THE LAST ONE IS THE WINNER  (AND THE WINNER TAKES IT ALL !...)       */
 /******************************************************************************/
     if (YOU_WANT_TO_START_ON_ANOTHER_PAGE) { //  select one
-        gtk_check_button_set_active (GTK_CHECK_BUTTON (widget_get_btt_synth()), TRUE);
-        gtk_check_button_set_active (GTK_CHECK_BUTTON (widget_get_btt_rules()), TRUE);
-        gtk_check_button_set_active (GTK_CHECK_BUTTON (widget_get_btt_state()), TRUE);
-        gtk_check_button_set_active (GTK_CHECK_BUTTON (widget_get_btt_data()),  TRUE);
+        gtk_check_button_set_active (GTK_CHECK_BUTTON (btt_SYNTH), TRUE);
+        gtk_check_button_set_active (GTK_CHECK_BUTTON (btt_STATE), TRUE);
+        gtk_check_button_set_active (GTK_CHECK_BUTTON (btt_RULES), TRUE);
+        gtk_check_button_set_active (GTK_CHECK_BUTTON (btt_DATA),  TRUE);
     } else
-        gtk_check_button_set_active (GTK_CHECK_BUTTON (widget_get_btt_rules()), TRUE);
+        gtk_check_button_set_active (GTK_CHECK_BUTTON (btt_RULES), TRUE);
 }