Scala forced me to do casting!: 1.Demonstration

import java.io.File

import scalafx.Includes._
import scalafx.application._
import scalafx.application.JFXApp._
import scalafx.geometry._
import scalafx.Includes._
import scalafx.scene._
import scalafx.scene.paint._
import scalafx.scene.layout._
import scalafx.scene.control._
import scalafx.scene.text._


object Main extends JFXApp {
  stage = new PrimaryStage {
    width = 640;height = 480
    scene = new Scene {
      root = new VBox {
        content.addAll(new StackPane{content = new Text("Demo")})
      }
    }
  }
}