Detail function not available in grid application when it is used as a nested grid

I have a grid application where the detail function is enabled, i.e. there is then at runtime a magnifying glass icon to the left of each row, which when pressed leads to the detail form. This works fine when the grid application is included in the Detail part of a Master/Detail form. However, when I include the exact same grid application as a nested grid of another grid application (i.e. the other grid application is the top level grid), the icon to access the Detail form of the grid is missing, and so the detail data of the nested grid rows cannot be displayed.

Is this some bug, or is there something that I need to do

Nested grids are just for view-data as is. Without search, editing, detail mode and so on. Just the grid data.
But you can create your own column with a button to show a form for example

Thanks for the clarification, Giu!

Do you know of any good reference (forum post, SC help webpage or video) for creating such column based buttons in each row of a grid?
(As far as I know, you need to specially code it, i.e. its not a standard SC feature).