class ReplaceWithDemo : App(LoginView::class) {
    override fun createPrimaryScene(view: UIComponent) = Scene(view.root, 480.0, 320.0 )
}

class LoginView : View("Login") {

    override val root = vbox {
        button("Log In") {
            setOnAction {
                replaceWith(MainView::class)
            }
        }
        alignment = Pos.CENTER
    }
}

class MainView : View("Main") {
    override val root = vbox {
        label("Workspace Content")
        alignment = Pos.CENTER
    }
}