select2 add option with ajax enabled

Question

I have this select2:

 $('#order_address_select').select2({
            placeholder: "Sratr typing...",
            ajax: {
                url: 'mysite/myurl',
                dataType: 'json',
            },
            tags: true,
        });

And then I am trying to add options dynamically

var newOption = new Option('myoption',1,false,false);
    $('#order_address_select').append(newOption).trigger('change');
    $('#order_address_select').select2('open');

new option appends in my <select></select> tag, but nothing appears in dropdown list. How do I resolve this?