Can polymer-selector do an initial check for active

[robdodson]

In some situations it's easier to set a menu item as active instead of setting a selected index. For example, here's some markup from the Polymer site:

<dropdown-panel>
  <polymer-ui-menu-item
    src="/images/picons/ic_guide_dark_.png"
    label="Start"
    href="/docs/start/getting-the-code.html"
    {% if page.navgroup == 'start' %}active{% endif %}>
  </polymer-ui-menu-item>

  <polymer-ui-menu-item
    src="/images/picons/ic_book_dark_.png"
    label="Docs"
    href="/docs/polymer/polymer.html"
    {% if page.navgroup == 'docs' %}active{% endif %}>
  </polymer-ui-menu-item>

  <polymer-ui-menu-item
    src="/images/picons/ic_feedback_dark_.png"
    label="Resources"
    href="/resources/faq.html"
    {% if page.navgroup == 'resources' %}active{% endif %}>
  </polymer-ui-menu-item>

  <polymer-ui-menu-item
    src="/images/picons/ic_people_dark.png"
    label="Community"
    href="/discuss.html"
    {% if page.navgroup == 'community' %}active{% endif %}>
  </polymer-ui-menu-item>
</dropdown-panel>

Is it possible for polymer-selector to do an initial check of its children to determine which item is selected? Without this check, if I assign another item as selected it will not remove the original active attribute and I end up with two active items.