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