java - <h:commandButton> inside <c:forEach> doesn't trigger method -

this question has answer here:

• commandbutton/commandlink/ajax action/listener method not invoked or input value not set/updated 9 answers
• p:commandbutton not working inside c:foreach [duplicate] 1 answer

i'm beginner jsf , i've small problem, if use h:commandbutton inside c:foreach doesn't trigger method if use outside c:foreach works. in code below "first test" works not "second test".

do guys have idea why doesn't work?

thanks in advance

<p:panel>     <h:panelgrid id="searchresult">         <!--  first test -->         <h:commandbutton value="id" action="#{database.addshow(257655)}">             <f:ajax execute="@this"/>         </h:commandbutton>          <!--  second test -->         <c:foreach items="#{thetvdb.series}" var="item">             <h:panelgroup styleclass="searchresultelement" layout="block">                 <h:outputtext value="#{item.name}"/><br/>                  <h:graphicimage value="#{item.banner}" />                  <h:commandbutton value="#{item.id}" action="#{database.addshow(257655)}">                     <f:ajax execute="@this"/>                 </h:commandbutton>             </h:panelgroup>         </c:foreach>     </h:panelgrid> </p:panel> 

update : answer in topic doesn't work