<p:selectManyMenu id="person" value="#{sB.selectedPersons}"
    style="width:300px;height:230px" showCheckbox="true"
                filter="true" filterMatchMode="contains" scrollHeight="200">
    <f:selectItems value="#{sB.persons}" var="person"
                itemLabel="#{person}" itemValue="#{person}" />
    <p:ajax event="change" update=":fltfrm:hperson :datfrm" />
</p:selectManyMenu>