<rich:columnGroup/> and column headers problem

[alexguru]

I'm using <rich:columnGroup/> to set different background to rows. If i use <f:facet name="header" /> for table all ok. But if i use <f:facet name="header" /> for column it don't render. Without <rich:columnGroup/> all work fine.
Code:

<rich:dataTable value="#{myBean.tableData}" var="row" rowKeyVar="row_key" rowClasses="row1, row2" >

 <rich:columnGroup rowClasses="#{row.error == null? ' ' : 'errorRow'}" >

 <rich:column style="text-align:center;">
 <f:facet name="header">
 <h:outputText value="#"/>
 </f:facet>
 <h:outputText value="#{row_key + 1}"/>
 </rich:column>

 <rich:column>
 <f:facet name="header">
 <h:outputText value="Name"/>
 </f:facet>
 <h:outputText value="#{row.name}"/>
 </rich:column>

 </rich:columnGroup >

[alexguru]

Am I doing something wrong or it is a <rich:columnGroup /> bug?