diff --git a/callback.c b/callback.c
index 24f2996..66f3503 100644
--- a/callback.c
+++ b/callback.c
@@ -48,17 +48,18 @@ void ui_toggle_exec_edit (GtkWidget *btt_exec_xor_edit, GtkWidget *btt_run_stop_
 {
   if (get_exec_edit_mode()) {
     gtk_button_set_icon_name (GTK_BUTTON (btt_exec_xor_edit), "system-run-symbolic");
+    gtk_button_set_icon_name (GTK_BUTTON (btt_run_stop_model_exec), "media-playback-start-symbolic");
+    gtk_widget_set_sensitive (GTK_WIDGET (btt_run_stop_model_exec), TRUE);
     set_exec_edit_mode (0);
   } else {
     gtk_button_set_icon_name (GTK_BUTTON (btt_exec_xor_edit), "document-edit-symbolic");
     gtk_button_set_icon_name (GTK_BUTTON (btt_exec_xor_edit), "text-editor-symbolic"); // I hesitate
     set_exec_edit_mode (1);
-
-    if (! get_run_xor_stop_exec()) {  //  il faudra une pop-up window, ici,    TODO
-        // pour prévenir l'utilisateur du risque de perte des données de la simulation en cours
-      set_run_xor_stop_exec (0);
-      gtk_button_set_icon_name (GTK_BUTTON (btt_run_stop_model_exec), "media-playback-pause-symbolic");
-    }
+    //   Ici, il faudra prévenir l'utilisateur par une pop-up window :   TODO   (sauvegarde automatique sinon)
+    //   S'il ne prend pas la main, les données de la simulation en cours risquent d'être perdues
+    gtk_button_set_icon_name (GTK_BUTTON (btt_run_stop_model_exec), "media-playback-pause-symbolic");
+    gtk_widget_set_sensitive (GTK_WIDGET (btt_run_stop_model_exec), FALSE);
+    set_run_xor_stop_exec (0);
   }
 }