output same form buttone on same page - drupal_render($form I try to duplicate form button on the same page. The button is printed like this

drupal_render($form['continue_shopping']);


The problem is that once I render the button, the second one is not rendered again later in DOM. How to overcome this? Thank you
From the top of my head, I would just duplicate the button in hook_form_alter() and render it as two separate buttons. 

Some code examples here:
https://www.drupal.org/node/1415334

And here:
How to add extra save buttons