A modern programming language that makes developers happier.

kotlinlang

I also just upgraded to the latest version of IDEA , just in case that was of any impact , still same issues

Used star import and was not able to locate vbox 

I'm no expert either, but shouldn't that be
``` override val root = vbox {```

Haha, right :smile: These types of mistakes are somehow the hardest to catch. I had something along these lines last week, wasted an hour.

son of a b---- gun !!! , thanks haven't done kotlin in a bit and its my first foray into TornadoFX, although I have to say that I'm disappointment that IDEA was not more helpful, they invented the language after all