Quanta autocompletion

Hello ,
I'm trying to make a Tag DTD for a PHP library and I have some questions.
I wrote a file named Action.tag  with the following structure:

<!DOCTYPE tags>
<tags>
  <tag name="Action" type="class" extends="Component" version="PHP5">
  </tag>
  <tag name="initialize" type="method" class="Action" version="PHP5">
    <attr name="$context" type="Context" status="required"></attr>
  </tag>
  <tag name="preExecute" type="method" class="Action" version="PHP5">
  </tag>
  <tag name="postExecute" type="method" class="Action" version="PHP5">
  </tag>
  <tag name="forward" type="method" class="Action" version="PHP5">
    <attr name="$module" type="string" status="required"></attr>
  </tag>
</tags>

In Quanta, when I write:

$a =  new Action();
$a->

And type <CTRL+SPACE>, Quanta shows me a selection box with all
methods of Class Action. OK.

But when I write inside a class that extends Action:

class MyAction extends Action {
  public function executePrint() {
    $this->
  }
}

And type <CTRL+SPACE>, Nothing happens. I want Quanta show me the
methods of Action class.
Is it possible to do this?

I hope you can understand me. Thanks!