frames.php
public function getFrameFocus()
    {
        if ($this->focus === false) {
            return array();
        }

        return array_merge(
                array($this->getPublicNameFromIndex($this->focus)),
                $this->frames[$this->focus]->getFrameFocus());
    }
public function getFrameFocus()
    {
        if ($this->focus === false) {
            return array();
        }

        return array_merge(
                array($this->getPublicNameFromIndex($this->focus)),
                $this->frames[$this->focus]->getFrameFocus());
    }
Accessor for current frame focus.
Will be false if no frame has focus. Will have the nested frame focus if any.

@return array     Labels or indexes of nested frames.