Grid's checkboxes (run button) disappear when linking into a form

Hello,

I am trying to put a grid with checkboxes using run button inside a form :

When I use master/detail option, the checkboxes disappear.
When I use a simple link, the grid doesn’t show in the fields positioning of the form (single row).

How can I manage to get a grid with checkboxes into a single row form ?

That works with tabs application instead of a form but that’s not really what I would like.

I am using the last version of SC.

I hope you can help me,
Thanks in advance.