{% set options = { items: {'@page.children': blog.url }, 'order': {'by': 'title', 'dir': 'asc'} } %}

<ul>
  {% for p in blog.collection(options) %}
  {% set active_page = (p.active or p.activeChild) ? 'active' : '' %}
    <li>
      <a href="{{ p.url }}" class="{{ active_page }}">
        {{ p.menu }}
      </a>
    </li>
  {% endfor %}
</ul>