try
        {
            Field f = TextureMap.class.getDeclaredField("mapRegisteredSprites");
            f.setAccessible(true);
            Map map = (Map) f.get(event.map);

            map.put("randomthings:testCompass", new TextureCustomCompass("randomthings:items/testCompass"));
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }