Topic: ButtonBar shown when site is first loaded; showOverlay="HOVER"
While making sure your mouse is not over the content area of your web browser, open this site:
The pause, previous, and next buttons are shown even though showOverlay="HOVER".
If you put your mouse over the SimpleViewer app and then move it off, the overlay behaves correctly. The only problem is that SimpleViewer behaves as if the mouse is over itself when it first loads.