iOS Making programmatic UIButton highlight onclick

Check out, for example, the UICatalog sample app. Under "Buttons", click the first button (labeled "Gray") and no visual feedback is given to the user that it was clicked. You have to hold down in order to make it appear that it was clicked. In fact, the button *is* being clicked in the first case, it's just not visually showing that (I know this because you can look in the console logs which running the simulator).

Is this a bug? Expected behavior? In either case, how do I make it look like the button is being clicked when it is clicked. Note that if you make a button with IB, there is no problem. So it's something with programmatically generating buttons.

Thanks,
Rob

This may be about buttons inside of table views. When I place the button on top of the table view (instead of in a table cell), the clicking behavior is normal.