diff -r 8acde7d27904 -r 1d001eb694dc test/sandbox.c
--- a/test/sandbox.c	Sun Jan 21 14:01:27 2024 +0100
+++ b/test/sandbox.c	Tue Jan 23 21:34:12 2024 +0100
@@ -52,17 +52,18 @@
     AscWindow *window = asc_window_initialize(0, &settings);
     asc_shader_initialize_predefined();
 
+    // create fps counter and add it to the UI
     asc_set_font(asc_font(ASC_FONT_REGULAR, 24));
     asc_ink_rgb(255, 0, 0);
-    AscText *fps_counter = asc_text(50, 50, "9999 FPS");
+    AscText *fps_counter = asc_text(50, 50, "XXXXX FPS");
     unsigned last_fps = 0;
+    asc_scene_add(&window->ui, asc_node(fps_counter));
 
-    while (asc_loop_next()) {
+    do {
         // quit application on any error
         if (show_message_box_on_error(window->window)) break;
 
-
-        // fps counter
+        // update fps counter
         if (asc_context.elapsed_millis > 0) {
             unsigned fps = 1000u / asc_context.elapsed_millis;
             if (fps != last_fps) {
@@ -71,11 +72,7 @@
                 asc_text_update(fps_counter);
             }
         }
-        asc_text_draw(fps_counter);
-    }
-
-    // TODO: maybe nodes should also be "garbage collected"
-    asc_text_free(fps_counter);
+    } while (asc_loop_next());
 
     asc_context_destroy();
     return 0;