Вставить в карточку товара в админке поле типа media - Общие вопросы и ошибки

JFormHelper::loadFieldClass('media');
	$field2 = new JFormFieldMedia();
	$field2->setup(new SimpleXMLElement('<field name="name_field" type="media" asset_field="name_field" asset_id="" created_by="" directory="images" link=""/>'), $product->name_field);

$field2 = new JFormFieldMedia(JForm $ваша_форма);

$field2 = new JFormFieldMedia();
$field2->setForm($ваша_форма);

JFormHelper::loadFieldClass('media');
$field2 = new JFormFieldMedia();
$field2->setForm($adminForm);
$field2->setup(new SimpleXMLElement('<field name="bgimg2" type="media" asset_field="" asset_id="" created_by="" directory="images" link=""/>'), $product->bgimg2);

jimport( 'joomla.src.form.field.MediaField' )

$adminForm->setField(SimpleXMLElement $xml_вашего_поля); 
// и если нужно
$adminForm->setValue($имя_вашего_поля, $group, $value);

$new_media_field = new SimpleXMLElement('<field name="bgimg2" type="media" asset_field="" asset_id="" created_by="" directory="images" link="" label="New Media Field"/>');
$this->form->setField($new_media_field);
...
                <div class="control-group">
                    <div class="control-label"><?php echo $this->form->getLabel('bgimg2'); ?></div>
                    <div class="controls"><?php echo $this->form->getInput('bgimg2'); ?></div>
                </div>

	JFormHelper::loadFieldClass('media');
	$field2 = new JFormFieldMedia();
	$field2 = new SimpleXMLElement('<field name="bgimg2" type="media" asset_field="" asset_id="" created_by="" directory="images" link=""/>');
	$this->form->setField($field2);

	JFormHelper::loadFieldClass('media');
	$field2 = new JFormFieldMedia();
	$field2 = new SimpleXMLElement('<field name="bgimg2" type="media" asset_field="" asset_id="" created_by="" directory="images" link=""/>');
	$adminForm->setField($field2);

$field2 = new JFormFieldMedia();

$this->form = JForm::getInstance('products', '<form><fieldset></fieldset></form>', array('control' => '', 'load_data' => true), false, false);
$new_media_field = new SimpleXMLElement('<field name="bgimg2" type="media" asset_field="" asset_id="" created_by="" directory="images" link="" label="New Media Field"/>');
$this->form->setField($new_media_field);

...

echo $this->form->getLabel('bgimg2');
echo $this->form->getInput('bgimg2');

	$this->form = JForm::getInstance('products', '<form><fieldset></fieldset></form>', array('control' => '', 'load_data' => true), false, false);
	JFormHelper::loadFieldClass('media');
	$field2 = new SimpleXMLElement('<field name="bgimg2" type="media" asset_field="" asset_id="" created_by="" directory="images" link=""/>');
	$this->form->setField($field2);

$this->form->setValue('bgimg2', null, $product->bgimg2);