This would however fail a very important criterium of patents:
In order to be patented an invention must be novel, useful, and not of an
obvious nature.

Peter

> However, it must be realised that patents cover innovation that can
include
> the combination of various previously known things that are combined in a
> unique manner. In this case the "button" referred to is presumably a
screen
> depiction of a button and not a physical button - and that is a vast
> difference in patent terms. I wonder how many of the prior art activities
> relate to screen objects using a pointing device (aka mouse)?

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