Label EL not supported for required validation failures?

[Counsell, Keith M.]

Are EL labels not supported by <tr:messages/> when required inputs are
not populated?  For example:
 
<f:loadBundle basename="ApplicationMessages" var="messages"/>
<tr:messages/>
<tr:inputText label="#{labels['foo']}" required="true"/>
<tr:commandButton text="Submit"/>
 
The messages tag shows only "- Value Required." if the inputText is not
filled in.
 
I've tested this with the 2006-12-04 and 2006-12-14 builds.
 
Thanks,
Keith