OverlayPanel

<pm:content styleClass="jqm-content">
    
    <p:panelGrid columns="2">
        <p:commandButton id="btn-basic" value="Basic" type="button"/>
        <p:commandButton id="btn-dynamic" value="Dynamic" type="button"/>
    </p:panelGrid>

</pm:content>

<p:overlayPanel for="btn-basic" widgetVar="pnl-basic" at="right" >
     <h2>Panel Content</h2>
     <p:menu>
         <p:menuitem value="Link 1" url="#" icon="ui-icon-info"/>
         <p:menuitem value="Font awesome icon" url="#" icon="fa fa-headphones"/>
         <p:separator />
         <p:menuitem value="Link 3" url="#" />
     </p:menu>
 </p:overlayPanel>

 <p:overlayPanel for="btn-dynamic" widgetVar="pnl-dynamic" at="right" dynamic="true">
     <h2>Dynamic Content</h2>
     <p>This content is loaded on demand to speed up initial page load time.</p>
 </p:overlayPanel>