Intercept sendback function at popup def

@IemmaJedi
I think that it’s possible. You can load javascript into popup window and change attribute onclick. For example (using jquery):

$("table tr td:nth-child(1)".each(function() {
  let oldclick=$( this ).attr( "onclick" );
  $( this ).attr( "onclick","<your code/function_name>"+ oldclick );
});