These days it seems like we just cannot live without navigation buttons that help us move our selection up, down, left or right. Here are some examples of such buttons:-

Of the six devices in the picture above, all have good, robust designs except for one. No prizes for correctly guessing which one. It’s been giving me a lot of headaches lately. It gets very frustrating when you can’t go a certain direction, and there is no other way to do it!