Resolving Topicrefs in XML Author

This another question that comes up in my evaluation of XML Author. If I want to resolve topicrefs in a ditamap, the documentation and videos tell me to select a topicref in the Document View and then click DITA > Resolve Topicref(s). However DITA > Resolve Topicref(s) is greyed out. Only valid in full FrameMaker? Not available in evaluation copy? Silly user error?

Has anyone gotten this to work as described?