I would add another bug in the "inlineadd"; do not work the validation rules required, which are active in the "add dialog window"
Any help appreciated

I just sent you an updated build. The detail grid toolbar icons will be disabled by default now.
And will be enabled once master grid row is selected.

It will resolve both add dialog and inline add cases.

PS: I am unable to produce the validation rules issue with inline add. Can you tell steps to regenerate this issue.

Thanks

I thank you for your courtesy and availability.
I decided to avoid the inline operations because working with grid & subgrid and using keys shortcuts in the subgrid these go in conflict with the master grid.