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

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