Runner.displayPopup - Open ADD page from Dashboard

PHPRunner version: 10.91 (Build 41619 x64)

Hello,
The issue I am facing is as follow...

There is a Dashboard with a Master table list in it.
The Master table is having 5 Details table lists, out of which 2 are used in the dashboard.
In one of these Details table list, there is a custom buttom that is expected to open an ADD form from another table (not linked to the Master table).
I am trying to use the Runner.displayPopup function to do so, using the format:
var url = "table_add.php";
var header = 'Title-Header';
window.popup = Runner.displayPopup({url : url,
width: 900,
height: 550,
header: header
});

The result I get is a popup with the Dashboard in it.
When I try any associated Details tables (ADD view), I get the LIST view from the table, not the ADD view.

Any suggestions?
Thank you in advance!