function on_xml_read()
    RegisterScriptCallback("on_xml_read", function(xml_file_name, xml_obj)
        local xml_to_change = [[ui\ui_mm_main_16.xml]]

        if xml_file_name == xml_to_change then
            local quit_save = [[<btn name="btn_quitsave" caption="ui_mm_quitsave" />]]
            local mm_single = xml_obj:query("menu_main_single")
            local mm_single_dead = xml_obj:query("menu_main_single_dead")
            if is_not_empty(mm_single) then
                local el = mm_single[1]
                xml_obj:insertFromXMLString(quit_save, el, #el.kids)
            end
        end
    end)
end