Hi Daniil,
Yes, you're correct! I'm tired and in need of coffee badly :-). By the way, the page layout and methodology is almost the same with the sample demo on your web site
https://examples1.ext.net/#/GridPane...etails_Window/
I can see you my simplified page, but not sure I can send the rest of other stuffs like database file, etc.
Is it possible that you can use the existing example from the link above, add an additional tab with checkboxgroup and populate it with the checkboxes whenever you select the Details column? If you can do this, I think I can manage using your example and retrofit into my page.
Many thanks for your patience and support.
Dan