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Child Table Trigger on Close

When Child Table row is opened, the child table event name is form_render

What is the event name before Child Table row is closed (the triangle of the child form is clicked)?
I want to do something like a validate to check the values of the child form (like validate) which the triangle that closes the child form is clicked, but validate does not work on Child Table. Thanks

Had you find any solution for this issue? I also want to trigger event on backdrop click of child table dialog box.