No messages displayed through h:messages

Hi all,
I have got a page that doesn't display the facesmessages I added to the context in my backingbean. I use the following code
Backing bean:
     public void addDisplayMessage(FacesMessage.Severity severity, String summary, String detail) {
          FacesMessage fm = new FacesMessage(severity,summary,detail);
          FacesContext.getCurrentInstance().addMessage(null,fm);
addDisplayMessage(FacesMessage.SEVERITY_ERROR,"message","message");JSP:
<t:div styleClass="messages">
    <h:messages globalOnly="true" fatalClass="messagefatal" errorClass="messageerror" warnClass="messagewarn" infoClass="messageinfo" />
</t:div>I do not understand why it doesnt work on this page, because it does work on other pages!
Also, it seems that the messages are removed from context when the action where I call addDisplayMessage() redirects me to the same page.
Thanks
Ruud.

Ok I already solved it myself....
I didnt have a navigation-rule in my facesconfig file because the page submits to itself.
Now I added one for this page without the <redirect/> tag and it works.
But I still dont understand it exactly, I know it has something to do with that FacesContext is request scope....

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