Adding/removing style on OptionGroup items

Hi everyone,

I have an OptionGroup with a few items and I’d like to

<div class="v-select-optiongroup">
	<span class="v-radiobutton v-select-option">
		<input type="radio" name="PID3648" value="on" id="gwt-uid-8" tabindex="0" />
		<label for="gwt-uid-8">
			<div>Option 1</div>
		</label>
	</span>
	<span class="v-radiobutton v-select-option">
		<input type="radio" name="PID3648" value="on" id="gwt-uid-9" tabindex="0" checked="" />
		<label for="gwt-uid-9">
			<div>Option 2</div>
		</label>
	</span>
	<span class="v-radiobutton v-select-option">
		<input type="radio" name="PID3648" value="on" id="gwt-uid-10" tabindex="0">
			<label for="gwt-uid-10" />
			<div>Option 3</div>
		</label>
	</span>
</div>