How do layer visibility work ?

noob question ))

I have 2 layers , both non transparent. Upper layer (0) visible, down (1) - invisibe on start.

A button is on the upper, visible layer. On button click

Set - Layer 0 invisible, Layer 1 - visible.

But why the button, that is on visible upper layer, doesnot dissapear after the click?

dropbox.com/s/wnnz80kz0kkwj5y/visibility.capx?dl=0

see the difference?

YES ,

It obviously makes a difference

thanks korbaach !