mport javafx.beans.property.SimpleBooleanProperty
import tornadofx.*

class ProgressFragment : Fragment("My Progress Fragment") {

    val showProgressProperty = SimpleBooleanProperty(true)
    var showProgress by showProgressProperty

    override val root =
        progressbar() {
            visibleWhen{ showProgressProperty }
        }
}

class MyView: View(){

    var myFragment by singleAssign<ProgressFragment>()

    override val root = vbox{

        add( ProgressFragment::class ){
            myFragment = this
        }

        button("Show"){
            action{
                myFragment.showProgress = true
            }

        }

        button("Hide"){
            action{
                myFragment.showProgress = false
            }

        }
    }
}