I've created a war project using seam-gen and created a new project using File > Other > General > Project and used the same name that I used on seam-gen.

Here's my xhtml file:

<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
    xmlns:s="http://jboss.com/products/seam/taglib"
    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:rich="http://richfaces.org/rich"
    template="layout/template.xhtml">

<ui:define name="body">
    <h:form>     
        <rich:panel>
                <f:facet name="header">Registration Form</f:facet>
               
                <h:panelGrid columns="2">
                        Username: <h:inputText value="#{user.username}"/>
                        Real Name: <h:inputText value="#{user.name}"/>
                        Password: <h:inputText value="#{user.password}"/>
                </h:panelGrid>
        </rich:panel>

        <div class="actionButtons">
           <h:commandButton value="Submit" action="#{register.register()}"/>
        </div>

    </h:form>

</ui:define>
</ui:composition>

But for some reason, only <rich:panel> tag shows content assist help. Other tags such as h, f, rich:form or even rich: doesnt show a content assist.

Is content assist possible with seam-gen (Seam 2.2.0.GA), JBoss Tools (for eclipse 3.5 milestone release) and Eclipse 3.5