ADF Faces useWindow attribute

Question

I am trying to open a Dialog window using an af:CommandLink. It is not opening a new window, only navigating to the page as normal. Is there anything obvious I am doing wrong? I have also seen this syntax
useDialog="true"
The IDE is rejecting this as not part of the tld. It may have been part of an earlier version of ADF Faces?
Here is the script from the page
<af:table   var="row"
            value="#{accountBacking.accounts}"
            rows="5"
            banding="row"
            styleClass="table.sample"
            binding="#{accountBacking.table}"
            >
.......Trimmed for relevance.........
    <af:column formatType="icon">
        <f:facet name="header">
            <af:outputText value="Edit"/>
        </f:facet>                      
        <af:commandLink useWindow="true"
                        action="#{accountBacking.editAccountAction}"
                        partialSubmit="true">
            <af:objectImage source="/images/edit-blue.gif"/>
        </af:commandLink>
    </af:column>
.......Trimmed for relevance.........
</af:Table>

Answer 1

I figured it out. In older examples where useDialog was used, the return value from the action was "process:something". This was also defined as a navigation rule in faces-config.xml
I found an example from oracle that uses the useWindow attribute. Instead of "process:something" it should be "dialog:something"
Here is the example
http://www.oracle.com/webapps/online-help/jdeveloper/10.1.3/state/content/navId.4/navSetId._/vtTopicFile.jsf_apps%7Cadfcreate%7Caf_acommandanddialog~html/