Сохранение группы полей в компоненте - Разработка расширений для Joomla 3.x

<?xml version="1.0" encoding="utf-8"?>
<form>
...
 	<fields name="images" label="COM_CLIENTS_FIELD_IMAGE_OPTIONS"> 
		<field
			name="image_intro"
			type="media"
			label="COM_CLIENTS_FIELD_INTRO_LABEL"
			description="COM_CLIENTS_FIELD_INTRO_DESC" />
		<field
			name="image_full"
			type="media"
			label="COM_CLIENTS_FIELD_FULL_LABEL"
			description="COM_CLIENTS_FIELD_FULL_DESC"/> 
	</fields>
 ...
</form>

<?php echo $this->form->getControlGroup('images'); ?>
<?php foreach ($this->form->getGroup('images') as $field) : ?>
<?php echo $field->getControlGroup(); ?>

if ( isset( $data['images'] ) && is_array( $data['images'] ) ) {
	$registry = new JRegistry;
	$registry->loadArray( $data['images'] );
	$data['images'] = (string)$registry;
}

public function save( $data ){
	if ( isset( $data['images'] ) && is_array( $data['images'] ) ) {
		$registry = new JRegistry;
		$registry->loadArray( $data['images'] );
		$data['images'] = (string)$registry;
	}
	return parent::save( $data ); 
}

public function getItem( $id = null )	{
	if ( $item = parent::getItem( $id ) ) {
		$registry = new JRegistry;
		$registry->loadString( $item->images );
		$item->images = $registry->toArray();
	}
	return $item;
}