tornadofx | Lightweight JavaFX Framework for Kotlin

I'm new with Kotlin and I'm trying to make a button open Windows notepad.

I'm doing a calculator and I wanted to implement a button to open the notepad, so the user could easily take notes at the moment of using it.

I've tried to directly use Java to execute it in runtime, but I couldn't.

I'm using TornadoFX for the GUI

Also searched for a way to do it on Kotlin, but didn't found anything.

Edit: Sorry for not including any code, but I didn't remember the exact thing I tried and I hadn't my PC, here's what I've tried:

1. Creating a Kotlin function with Java code

   fun apuntes(){ Runtime runtime = Runtime.getRuntime(); Process process = runtime.exec("C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Accessories" "C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Accessories"); }

2. Creating a Java class with the exact same code than before, declaring a variable with Kotlin

   var u: Notes = notas()

   fun onAction2(fn2: Notes){ u = fn }

Where Notes is a public class and notas is a function, then tried this, as it is how I'm working with the calculator buttons:

I'm trying to verify the CSS used in a Stylesheet that utilizes custom csspropertys but they don't seem to be working. I can't tell if I'm writing it all correctly and I'd like to check to see what is actually being used. Is there a way to print out a Stylesheet?

Edit: To be clear, these are TornadoFX classes, not just plain CSS. I am trying to verify type-safe CSS, not trying to print a CSS file.

This question is a bit simplistic, but i couldn't figure it out for myself... What I'm trying to do is using a JavaFX Timeline to update my Polyline points. What I've got until now is as follows:

We have a desktop JavaFX application (well, TornadoFX) that downloads an archive, extracts another app from it and launches this app with macOS open command. Simplified kotlin code looks like:

I am working on a simple UI using TornadoFX and FXML (without TornadoFx's DSL).
There is only one big button who call a function with a runasync inside and it's all working.

But... How can I bind, eg, a label text to track TaskStatus(), eg, title?

MyApp.kt

I was playing around with TornadoFX and wanted to add a horizontal line to my screen, to see how it works. I added it to my code as follows:

I've been trying out Tornadofx. trying to create a custom title-bar, here's the code I'm currently trying

I am currently trying to develop a little board game in Kotlin using TornadoFX, mainly for practice purposes. But I'm currently struggling with adding the pieces to the board. I have tried many different ways that seemed logical to me, but every time its ether giving me an error message or not working at all. So as I ran out of ideas or possible solutions I'm now asking for help here on stackoverflow (for the first time ever :-)).

What's the best way or the most idiomatic way of adding pieces to a checkers board from the Controller? I also should mention that I haven't really worked with JavaFX before, so I'm learning TornadoFX from the ground up.

Here is the View of my board:

I want to show a dialog inside my tornadofx application, but I don't want to create the dialog in the view. I've tried to create a dialog at the controller, but this doesn't seem to work.

This is an working example on how I can create a dialog inside my View