Is there any way I can make the foreign key field open a new layout (or a window) and allow me to select an entry from there instead of loading all values inside the dropdown?

Should I still hope for a reply?

Have you seen that is there any such option when you right click on it?

Sorry for being late for this answer.


Modal picker will soon be available instead of a combo.

Technically, you can try to understand how it works when you create a new menu item to your component.
- you will need to create special layout for that. (tmpl/modal.php) see in the back-end of your component.
- Then you can use JDom to call it easily. Have a look at classes/form/field/modal.php You have an example there.

Moved in 'New functionalities'

I am really sorry for inconveniency.
After a very long dev process, I am now reading and answering old posts. But all will be answered (600+)

Kind Regards.