How to close a page opened with Runner.displayPopup

A stated in https://xlinesoft.co..._in_a_popup.htm example 9

in order to close an add/edit page opened with Runner.displayPopup I've placed on the JS onload of the page the below code

if ((proxy['saved']) && window.parent && window.parent.popup) {
   window.parent.location.reload();
   window.parent.popup.close();
}

but window.parent.popup is undefined