the Tabchange event of the accordion primefaces panel does not work

I have a accordionPanel created dynamically and I want to get the identifier of the Tab that activates the user, for this I am making use of the only event ajax that can be applied to the accordions ( tabChange ), however this is never invoked.

Here is my xhtml file

<p:accordionPanel id="equipos" dynamic="true" activeIndex="null"
    value="#{equipoBean.equipoDecoradoList}" var="equipoDecorado">
    <p:ajax event="tabChange" listener="#{equipoBean.onChange}" />
    <p:tab title="#{equipoDecorado.equipo.nombre}" id="tab">

    </p:tab>
</p:accordionPanel>

and this is the method in the Backing Bean

public void onChange(TabChangeEvent event){
    System.out.println("omchnage");
}

But every time I select a Tab, the method is not called,

I would be very grateful if you can tell me what is wrong or what I need.