Bootstrap - show all Typeahead items on focus

I'd like to show all Typeahead items when the text-input (id="Questions") get focus. How can I do it?

Javascript:

function SetTypeahead() {
    $("#Questions").typeahead({
        minLength: 0,
        source: [
                "Q1?",
                "Q2?",
                "Q3?",
                "@4?"
        ]
    });
}