I'm not sure where to report this minor error.
In http://myfaces.apache.org/trinidad/trinidad-api/tagdoc/tr_table.html,
the sorting heading has the following example:
<tr:table value="...">
<tr:column sortProperty="firstname" sortable="true">
<f:facet name="header">
<tr:outputText value="Firstname" />
</f:facet>
...
</tr:column>
<tr:column>
<f:facet name="header" sortProperty="lastname" sortable="true">
<tr:outputText value="Lastname" />
</f:facet>
...
</tr:column>
</tr:table>
The sortProperty and sortable attributes belong to the tr:column, not
the f:facet. It should be:
<tr:table value="...">
<tr:column sortProperty="firstname" sortable="true">
<f:facet name="header">
<tr:outputText value="Firstname" />
</f:facet>
...
</tr:column>
<tr:column sortProperty="lastname" sortable="true">
<f:facet name="header">
<tr:outputText value="Lastname" />
</f:facet>
...
</tr:column>
</tr:table>