Java EE (Java Enterprise Edition) General Discussion

I'm battling with it for a week now...
I'm trying to create a table with 3 columns and to have header for each column.
This, don't display headers at all :

        <h:panelGrid styleClass="Context" columns="3">
            <h:panelGroup>
                <f:facet name="header">
                    <h:outputText value="#{prompts.Label_PROPERTYTYPE_ID}"/>
                </f:facet>
                <h:outputText value="null"/>
            </h:panelGroup>
            <h:panelGroup>
                <f:facet name="header">
                    <h:outputText value="#{prompts.Label_PROPERTYTYPE_DESCRIPTION}"/>
                </f:facet>
                <h:inputText value="#{PropertyType.typeDescription}" required="true"/>
            </h:panelGroup>
            <h:panelGroup>
                <f:facet name="header">
                    <h:outputText value=""/>
                </f:facet>
                <h:commandButton value="#{prompts.action_CREATE}"  action="#{PropertyType.Create}"/>
            </h:panelGroup>
        </h:panelGrid>

While this compress all headers into one <th>

        <h:panelGrid styleClass="Context" columns="3">
            <f:facet name="header">
                <h:panelGroup>
                    <h:outputText value="#{prompts.Label_PROPERTYTYPE_ID}"/>
                    <h:outputText value="#{prompts.Label_PROPERTYTYPE_DESCRIPTION}"/>
                    <h:outputText value=""/>
                </h:panelGroup>
            </f:facet>
            <h:outputText value="null"/>
            <h:inputText value="#{PropertyType.typeDescription}" required="true"/>
            <h:commandButton value="#{prompts.action_CREATE}"  action="#{PropertyType.Create}"/>
        </h:panelGrid>

Any help ?