AUI Multiple Select Box

We need to give multiple="true" in the normal select box

<aui:select label="Multiple select Example" helpMessage="Choose options" name="approver" multiple="true">
<aui:option value="1">option 1</aui:option>
<aui:option value="2">option 2</aui:option>

<aui:option value="3">option 3</aui:option>

</aui:select>


And In controller

String[] multipleOptions = ParamUtil.getLongValues(actionRequest, "approver");