[Trinidad] tr:inputText required="true" silently blocks submission

[noah]

I'm getting weird client side behavior with the tr:inputs.  It seems
to be connected to validation. The example below just has one required
field, but I get the same behavior on larger forms when other
validation rules are not satisfied.

<tr:document xmlns="http://www.w3.org/1999/xhtml";
  xmlns:ui="http://java.sun.com/jsf/facelets";
  xmlns:f="http://java.sun.com/jsf/core";
  xmlns:h="http://java.sun.com/jsf/html";
  xmlns:tr="http://myfaces.apache.org/trinidad";>
 <tr:form>
     <tr:messages />

     <h:outputText value="Foo=#{pageFlowScope.foo}" />
     <tr:inputText required="true" simple="true"
value="#{pageFlowScope.bar}" />
     <tr:commandLink text="foo">
        <f:setPropertyActionListener target="#{pageFlowScope.foo}"
value="bar" />
     </tr:commandLink>
  </tr:form>
</tr:document>

Anyhow, if the input field is blank clicking the link does nothing. No
messages, nothing.  If I switch to an h:inputText, the form submits
and I get a message.  Do I need to do something special to get
messages from the client side validation that appears to be going on?