diff --git a/src/ui/tree.c b/src/ui/tree.c
index 5185f88..a4a71f8 100644
--- a/src/ui/tree.c
+++ b/src/ui/tree.c
@@ -71,8 +71,35 @@ create_and_fill_model (void)
 void Hello(void)
 {
     GtkWidget *view; //  = gtk_tree_view_new ();
-    printf("Hello, from src/ui/tree.c ! -------------------------\n");
-    return NULL;
+    GtkCellRenderer *renderer = gtk_cell_renderer_text_new ();
+
+      gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (view),
+                                               -1,
+                                               "Name",
+                                               renderer,
+                                               "text", COL_NAME,
+                                               NULL);
+
+  /* --- Column #2 --- */
+  renderer = gtk_cell_renderer_text_new ();
+  gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (view),
+                                               -1,
+                                               "Age",
+                                               renderer,
+                                               "text", COL_AGE,
+                                               NULL);
+
+  GtkTreeModel *model = create_and_fill_model ();
+
+
+    printf("    Hello, from src/ui/tree.c ! ----------------------------------------------------------\n\
+    Remplacer la ligne 73 par : GtkWidget *view = gtk_tree_view_new ();\n\
+                 provoque une erreur de segmentation.\n\
+    La méthode suivie est d'insèrer progressivement des fragments de l'exemple suivant :\n\
+         For the impatient, here is a small tree view ‘Hello World’ program:\n\
+               https :// docs.gtk.org/gtk3/treeview-tutorial.html  \n\
+                 > Pourquoi cette erreur de segmentation ? <\n");
+    return NULL;q
 }