diff --git a/gtk_treeview_example b/gtk_treeview_example
index 4f010f5..b156cd3 100755
Binary files a/gtk_treeview_example and b/gtk_treeview_example differ
diff --git a/main.c b/main.c
index 34a7cd7..edc2dcb 100644
--- a/main.c
+++ b/main.c
@@ -75,12 +75,16 @@ GListModel* get_children_model (struct TreeNode_t *parent)
 {
     struct TreeNode_t *child;
 
-    GtkStringList *list = gtk_string_list_new(NULL);
+    GtkStringList *list = NULL;
     
     if (parent) {
         printf("[get_children_model] here is %s content : ", parent->text);
 
         child = parent->child;
+
+        if (child) {
+            list = gtk_string_list_new(NULL);
+        }
         while(child) {
              gtk_string_list_append(list, child->text);
              printf("%s ", child->text);
@@ -133,8 +137,18 @@ void bind_factory (GtkListItemFactory *factory, GtkListItem *list_item, gpointer
         text = gtk_string_object_get_string(GTK_STRING_OBJECT(gtk_tree_list_row_get_item(row)));
         GtkWidget *expander = gtk_list_item_get_child(list_item);
         gtk_expander_set_label(GTK_EXPANDER(expander), text);
-        printf("[bind_factory] here is %s content\n", text);
+
+
         gtk_tree_list_row_set_expanded(row, !is_expanded);
+
+        if (gtk_tree_list_row_get_children(row)) {
+            printf("[bind_factory] here is %s content (childs)\n", text);
+        } else {
+            printf("[bind_factory] here is %s content (no childs)\n", text);
+        }
+
+        gtk_widget_set_margin_start(expander, gtk_tree_list_row_get_depth(row)*20);
+
         //g_object_unref(row); // Decrease the reference count when done
     } else {
         printf("[bind_factory] here is NON %s content\n", text);
@@ -182,6 +196,7 @@ int main (int argc, char **argv)
     root = create_tree_node("Root");
     add_child_node(root, create_tree_node("Child 1"));
     add_child_node(root, create_tree_node("Child 2"));
+
     GtkApplication *app = gtk_application_new("org.gtk.example", G_APPLICATION_FLAGS_NONE);
     g_signal_connect(app, "activate", G_CALLBACK(app_activate), NULL);
     int status = g_application_run(G_APPLICATION(app), argc, argv);