Try input word that contains "ą" letter.
Keyboard Shortcut: Alt + A

http://selectize.github.io/selectize.js/#demo-tagging

Solution: http://stackoverflow.com/a/18570096
Disable "Select All" on Alt Gr key

if (event.ctrlKey && event.altKey) {
    // Appears to be Alt Gr
}