SelectOneListbox

<h:form id="form">

    <h:panelGrid columns="2" style="margin-bottom:10px" cellpadding="5"
                 columnClasses="label, column">

        <h:outputText value="Basic Usage: " />
        <p:selectOneListbox id="basic" value="#{buttonBean.number}">
            <f:selectItem itemLabel="Option 1" itemValue="1" />
            <f:selectItem itemLabel="Option 2" itemValue="2" />
            <f:selectItem itemLabel="Option 3" itemValue="3" />
        </p:selectOneListbox>

        <h:outputText value="Scrollbar: " />
        <p:selectOneListbox id="scroll" value="#{autoCompleteBean.selectedPlayer1}"
            converter="player" style="height:100px">
            <f:selectItems value="#{autoCompleteBean.players}"
                var="player" itemLabel="#{player.name}" itemValue="#{player}" />
        </p:selectOneListbox>

    </h:panelGrid>

    <p:separator />

    <p:commandButton id="submitButton" value="Submit" update="display" oncomplete="dlg.show()" />

    <p:dialog header="Selected Values" modal="true" showEffect="fade" hideEffect="fade" widgetVar="dlg">
        <h:panelGrid columns="2" id="display">
            <h:outputText value="Value 1:" /><h:outputText id="selectedNumber" value="#{buttonBean.text}" />

            <h:outputText value="Value 2:" /><h:outputText id="selectedPlayer" value="#{autoCompleteBean.selectedPlayer1}" />
        </h:panelGrid>
    </p:dialog>

</h:form>