如何将其他事件处理程序添加到jquery-ui datepicker实例？

var firstHandler = function(dateText,inst) {
    console.log('Original Handler',dateText,inst);
};

var secondHandler = function(dateText,inst) {
    console.log('Second Handler',inst);
};

$('#datepicker').datepicker({
    onSELEct: function() {
        var sinks = $(this).data("mySELEcts");
        for (var i = 0; i < sinks.length; i++)
            sinks[i].apply(this,arguments);
    }
}).data("mySELEcts",[firstHandler]);

$('#addBtn').click(function(event) {
    $('#datepicker').data('mySELEcts').push(secondHandler);
    $('#datepicker').data('mySELEcts').push(nthHandler);
});