code: private function _getThemes()
      {
          if ( is_null($this->_themes) ) {
              $config = $this->_getThemeConfig();
              $this->_themes = array();
              foreach ($config['themes'] as $identifier => $conf) {
                  $t = new Theme();
                  $t->setIdentifier($identifier);
                  $t->setName($conf['name']);
                  $t->setBasePath($conf['base_path']);
                  $this->_themes[$identifier] = $t;
              }
              if ( count($this->_themes) == 0 ) {
                  $t = new Theme();
                  $t->setIdentifier('default');
                  $t->setName('Default');
                  $t->setBasePath('bundles/vincetadmin/bootstrap/default');
                  $this->_themes['default'] = $t;
              }
          }
          return $this->_themes;
      }
docs: Gets themes
  
  @return array