extensions/treemap_reporter/treemap_recorder.php
public function paintMethodStart($message)
    {
        parent::paintMethodStart($message);
        $node = new TreemapNode('Method', $message);
        $this->_stack->push($node);
    }
public function paintMethodStart($message)
    {
        parent::paintMethodStart($message);
        $node = new TreemapNode('Method', $message);
        $this->_stack->push($node);
    }
acceptor for start of test method node