It's can't get the value in radio buttonset, if use ui.effects, in IE Browser

Effects & html radio buttonset, has a bug with IE. here is demo:

$().ready(function(){

$("#div1").buttonset();

$("#btnToggle").click(function(){

$("#div1").toggle('blind'); if use the effects, can't get the radio value. else, right.

});

$("#btnAlert").click(function(){

alert($("#div1 > input:checked").val()); if div1 hidden by the effect, the value is undefined in IE browser.

});

$("#div1 > :radio").click(function({

$("#div1").hide('blind');

}));

});

<button id="btnToggle">Toggle Div1</button>

<button id="btnAlert">Alert Checked</button>

<div id="div1">

<input type="radio" name="radio" id="radio1" value="1"><label for="radio1">Radio 1</label>

<input type="radio" name="radio" id="radio2" value="2"><label for="radio2">Radio 2</label>

<input type="radio" name="radio" id="radio3" value="3"><label for="radio3">Radio 3</label>

</div>