twitter bootstrap tooltip over select2

tooltip-over-select2.js

/**
 * Declate title attribute on target select element.
 * Initialize tooltip:
 */
jQuery("div.select2-container").tooltip({
    title: function() {
        return $(this).next().attr("title");
    },
});

Using the latest bootstrap and select2. I can't get it working properly, it only works if I remove "div" and define "title" manually. However, defining title manually isn't a solution. Could someone help on this?

$(".select2-container").tooltip({
    title: "abc",
});

Using tooltip semantic on the select element:
$("span.select2.select2-container").tooltip({
title: function() {
var title = $(this).prev().attr("data-original-title");
return title;
}
});