how to add autocomplete of typeahead with tagsinput

[visualo]

tagsinput works fine with static data, e.g
source: ["Alabama","Alaska","Arizona","Arkansas","California"],
but when I add autocomplete from typeahead, e.g
source: function (query, process) {
return $.get(URL,{ query: query },function (data) {
return process(data);
});
I get the data from the server, but typeahead does not generate the response in the submenu!