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DECLARE
   v_empno emp.empno%TYPE; 
   v_ename emp.ename%TYPE;
BEGIN
   --f10: checkbox
   --f20: empno
   --f30: ename
   --f50: empno again
   for i in 1..apex_application.g_f10.count
   loop
      for j in 1..apex_application.g_f50.count loop
         if apex_application.g_f10(i) = apex_application.g_f50(j) 
         then         
            -- access values for the selected rows in the other arrays
            v_empno := apex_application.g_f20(j);
            v_ename := apex_application.g_f30(j);

            apex_debug_message.log_message('Employee: '||v_empno||' - '||v_ename);
         end if;
      end loop;
   end loop;
END;

APEX_ITEM.CHECKBOX2( p_idx   => 1
                          , p_value => ID
                          , p_checked_values => 'CHECKED') seleccionado,