Display month and year DropDownList in jQuery UI DatePicker

hi

I have problem with datepicker, when click on textbox for change date datepicker appear.

but when change month and year size then is cuted, so how to resize dropdown month and year in datepicker.

I used code like this

<link rel="stylesheet" href="../js/themes/base/jquery.ui.all.css"> 
<link rel="stylesheet" href="../js/demos.css">
<script src="../js/jquery-1.8.3.js"></script>
<script src="../js/ui/jquery.ui.core.js"></script>
<script src="../js/ui/jquery.ui.widget.js"></script>
<script src="../js/ui/jquery.ui.datepicker.js"></script> 
<script type="text/javascript">
    $(function () {
        $("[id$=TextBox1]").datepicker({
            changeMonth: true,
            changeYear: true 
        });
    }); 
</script> 

thanks