public static function render($items)
 {
     $result = '';
     $odd = true;
     foreach ($items as $item) {
         list($message, $level, $category, $timestamp) = $item;
         $message = CHtml::encode($message);
         // put each source file on its own line
         $message = implode("<br/>", explode("\n", $message));
         $time = yiiDebugTrace::timestampToTime($timestamp);
         $odd = !$odd;
         $result .= '<tr' . ($odd ? ' class="odd"' : '') . '><td>' . $time . '</td><td>' . $level . '</td><td>' . $category . '</td><td>' . $message . '</td></tr>';
     }
     if ($result !== '') {
         $result = '<tbody>' . $result . '</tbody>';
     }
     $result = '<table><thead><tr><th>Time</th><th>Level</th><th>Category</th><th width="100%">Message</th></tr></thead>' . $result . '</table>';
     return $result;
 }