Select2 open dropdown on focus

Question

I have a form with multiple text inputs and some select2 elements. Using the keyboard to tab between fields works fine - the Select2 element behaves like a form element and

Answer 1

a bit late... but to share my code using select2 4.0.0

$("#my_id").select2();
$("#my_id").next(".select2").find(".select2-selection").focus(function() {
    $("#my_id").select2("open");
});