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<style type="text/css">
    .test.ui-selectonemenu-panel .ui-selectonemenu-items-wrapper {
        overflow: visible;
    }
</style>
<script type="text/javascript">
    $(window).load(function(){
        var $this = PF('OneMenuWidget');

        if($this) {
            $this.triggers.on('click', function() {
                $this.panel.perfectScrollbar({suppressScrollX: true});
            });
        }
    });
</script>

<p:selectOneMenu widgetVar="OneMenuWidget" panelStyleClass="test" ../>