protected function configure($options = array(), $attributes = array())
 {
     parent::configure($options, $attributes);
     // Parent requires the 'choices' option.
     $this->addOption('choices', array());
     $this->addOption('all_option_value', '-1');
     $this->addOption('show_all_locations', false);
 }
 protected function configure($options = array(), $attributes = array())
 {
     parent::configure($options, $attributes);
     // Parent requires the 'choices' option.
     $this->addOption('choices', array());
 }