Import page opened in popup via custom button

Hi all <img src='https://asprunner.com/forums/file.php?topicimage=1&fieldname=question&id=26274&image=1&table=forumtopics' class='bbc_emoticon' alt=':)' />
Does somebody knows how to open a different page in popup?
I have list 1 with a custom button.

I have list 2 used for imports
I would like the button to open in popup list2_import.php
The info was in the documentation already <img src='https://asprunner.com/forums/file.php?topicimage=1&fieldname=question&id=26274&image=2&table=forumtopics' class='bbc_emoticon' alt=':rolleyes:' />
https://xlinesoft.com/phprunner/docs/how_to_display_any_page_in_boo.htm
(Runner.displayPopup( {

url: "products_add.php"

});