Interesting. I can't see a way to get the title to display either, once you add a sheet directly to a storyboard.
However, you can do this:
Put the sheet on a dashboard -- even if it's the only thing on the dashboard. Display the title there. Then drag the dashboard to the storyboard instead of dragging the sheet directly.
Hi Joe - If you add worksheet to story, then title will not show up. The reason i can think of is because you will be already writing a story about what does the dashboard represents in story title. On the other hand, if you need something like title, you can just add "Description" available at the left hand side of story or as Joe mentioned, add worksheet to dashboard and then add dashboard to story.