In your <modulename>.webpart.xml you have there add the title so it reads:

<webpart xmlns="http://labkey.org/data/xml/webpart" title="Your title here"><view name="begin"/></webpart>

should work.

We were seeing that it didn't show up right away once the title was added (cached maybe?). We did ours with the standard layout as shown in Labkey docs and it works great.