protected function writePropertyGroupConfigurationElements(DOMElement $parent, Configuration $configuration)
 {
     XmlDom::createElement($parent, 'ConfigurationType', $this->convertConfigurationType($this->project->getType()));
     XmlDom::createElement($parent, 'UseDebugLibraries', $configuration->getDebug() ? 'true' : 'false');
     if (!$configuration->getDebug()) {
         XmlDom::createElement($parent, 'WholeProgramOptimization', 'true');
     }
     XmlDom::createElement($parent, 'CharacterSet', $this->convertCharacterSet($configuration->getCharacterSet()));
 }