How can i hide a button ?

Hi, sorry but i am very new at project siena ;)
I would like to have a picture and it should be hide by a button above it. Than i would click on the button, and it should hide, to see, what picture is under it.
How can i realise that ?
Thank you for your help !

Thank you for your help !!
But i have some furder problems:
instead of "If(ButVis = "No", false, true)" i had to set to "If(ButVis = "No"; false; true)" ... instead of comma i have to use semicolon
i can't make a concatenation like you made in OnSelect property :(  it show me a mistake when i set the semicolon
f.e : i only need to hide it once, so i dont need the first UpdateContext({ButVis:"Yes"}) ... it works fine, the button hides in the test mode, but if i close the testmode, the button still is hiding. How can i make it, that the button is visible
again, when i leave the testmode ?
Can it be, that some problems occure because i use the german version ?

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