@javafxpert Oh, cool! That looks like a pretty specialized UI, so you might not get all the benefits of more traditional UI building in TornadoFX, but there are plenty of extension functions in the framework even for such use cases, and in combination with Kotlin's syntax and features I'm pretty sure the code will be much more readable and maintainable than in plain JavaFX. Will have a look at your app as soon as I have time to see if I can give some more concrete pointers.