Use following jQuery after your jQuery UI script
for following example
<div id="radio">
<input type="radio" id="radio1" name="radio"><label for="radio1">Choice 1</label>
<input type="radio" id="radio2" name="radio" checked="checked"><label for="radio2">Choice 2</label>
<input type="radio" id="radio3" name="radio"><label for="radio3">Choice 3</label>
</div>
use this script
// select last radio label
var radio = $( "#radio" ).find('label').last();
//update border radius
$(radio).css('border-radius','0px 0px 4px 4px');