'fieldset', '#title' => t('Theme development settings'), ); $form['themedev']['zen_rebuild_registry'] = array( '#type' => 'checkbox', '#title' => t('Rebuild theme registry and output template debugging on every page.'), '#default_value' => theme_get_setting('zen_rebuild_registry'), '#description' => t('During theme development, it can be very useful to continuously rebuild the theme registry and to output template debugging HTML comments. WARNING: this is a huge performance penalty and must be turned off on production websites.', array('!link' => 'https://drupal.org/node/173880#theme-registry')), ); }