A modern programming language that makes developers happier.

kotlinlang

I have a nooby question again. I have a the following code 

`button(graphic = FontAwesomeIconView(FontAwesomeIcon.ARROW_RIGHT)) {  addClass(ApplicationStyle.diffNavButton) disableProperty().bind(model.hasNextRevision)}` where I want to disable the button if there is no next revision,
my model has a BooleanProperty but when I am calling `model.hasNextRevision` I get a `Property&lt;Boolean&gt;` on which I can't call `.not()`. What em I am missing here?