Refresh grid not working when application is TABBED

Hello.
I have a grid application, with a link to a form (single line ) to edit / update a single record.
When I close the form , I return to the original grid and the updated values are shown correctly (grid is refreshed ).

Issue arrives when the original grid is tabbed. The values in the DB are updated correctly (meaning application is correct), but the grid is not reloaded. Searching in the forum, I had to add a “refresh” php button to the grid, which triggers "sc_exit(sel) , so the grid is forcedly reloaded.

Anybody know whether is it possible to reload the grid automatically when app is tabbed ? I tried with several browsers and the behaviour is the same.
Thank, Federico