Open From when pressing "Add Row" in Child Table

Helo i am trying to get a From when i am pressing add_row in a Child Table. For example like in this video:
Assigning a Value to a Child Table Field in Frappe or ERPNext - YouTube Time: 4:09
or when i am in de Purchase Receipt Doctype and Click add Multiple.
Does my Child Table need a specific flag? How do i modify the From i get?

Thanks for every answer.

Ok i have the Answer. Thank you anyway!
If you have editable Grip enable you will not get a From on the click event add_row.