CommandLink in header of rich:tab not working

[pechnik]

Hello in header of rich:tab I have puted  a4j:CommandLink fro redirecting to another page.

<rich:tab>  
  <f:facet name="header">
          <a4j:commandLink value="Pair"  action="#{Stats.tab2}" execute="@this" />
  </f:facet>
</rich:tab>

public String tab2(){
       setTab("t2");
       System.out.println("tab2"); 
       return "t2";
}

But when i clicks the link, nothing hapense.

rich:tabPanel is in the server mode

How  a4j:commandLink in header can redirect to another page?

I am using Richfaces 4 with glassfish 3.1 and Mojara 2.1.1