<f:param> issue with spring webflow 2.0-m4

I am trying to use the <f:param> tag in a facelet page (xhtml) in order to retrieve it in the webflow context and use it later. The issue is that I can not find the parameter in any webflow, context/scope.

PS : When I display the source code of the page, I can find the parameter name
in the page. I am not sure but it seems that it used to work with the 2.0-m3 release of spring webflow.

Quote:

---

<h:commandButton action="myAction" value="button">
<f:param value="#{myBean.value}" name="myParam"/>
</h:commandButton>

---

The requestParameters.myParam expression referenced from your flow is not working? What's in your externalContext.parameterMap?