How to get the parent of a component in fx?

Question

Here is an example:
Index.fx:
Stage {
    title: "Online book library";
    width: 1024
    height: 768
    scene:Scene {
    fill: Color.WHITE
    content: [
       banner ,
       login = Login{translateX:715 translateY:135}
};Login.fx:
var logOn : Button = Button {
        translateX:25 translateY: 170
        text: "Log On"
        font: Font {size:11 name: "Verdana Bold"}
        action: function() {
            showHello();
function showHello(){
   // add a label in index.fx whose text is "welcome!";
    }I want to show something on the index.fx but I don't know how to get the parent from the child component?
In Flex, we use parent or parentApplication, Is there a similar function in JavaFX?

Answer 1

Reusing the same Tile example, I had no problems, I suppose I was doing wrong the first time:
def IMAGES_WIDTH = 100;
def IMAGES_HEIGHT = 100;
var COLUMN_NB = 3;
var ROW_NB = 3;
var scene: Scene;
var previews: Container;
Stage
  title: "Test of Tile layout"
  scene: scene = Scene
    width: 500
    height: 500
    fill: Color.LAVENDER
    content:
      previews = Tile
        hgap: 10
        vgap: 10
        layoutX: bind (scene.width - previews.width) / 2
        layoutY: bind (scene.height - previews.height) / 2
        columns: COLUMN_NB
        content: for (i in [ 1 .. COLUMN_NB * ROW_NB ])
          ImageView
            id: "IV{i}"
            image: Image
              url: "{__DIR__}clock.gif"
              width: IMAGES_WIDTH
              preserveRatio: true
            onMousePressed: Hide
function Hide(evt: MouseEvent): Void
  println("{evt.node} ({evt.node.id}) - {evt.node.parent}");
  var nm: Node = evt.node.parent.lookup("IV5"); // Middle node
  nm.visible = false;
  var ntl: Node = evt.node.parent.lookup("IV1"); //Top left node
  (ntl as ImageView).viewport = Rectangle2D { height: IMAGES_WIDTH/2, width: IMAGES_WIDTH/2 };
  (evt.node.parent as Tile).hgap = 20; // Strange effect, but works
}