CustomNode not recognized as its class type but as class javafx.scene.Node

Question

In the following code...
Stage {
    title: "Circles"
    scene: Scene {
        width: 200
        height: 100
        content: Box {}
class Circle1 extends CustomNode {
    public var Name: String = "Circle1";
    public var Radius: Integer = 50;
    override function create(): Node {
        return Group {
                    content: Circle {
                        radius: Radius;
                        fill: Color.rgb(50, 50, 50)
class Box extends CustomNode {
    public var Name: String = "Box1";
    var c1: Circle1 = Circle1 {Name: "c1"};
    var c2: Circle1 = Circle1 {Name: "c2"};
    var c_all = [c1, c2];
    def hbox = HBox {content: c_all};
    override function create(): Node {
        return Group {
                    content: hbox
    public function ChangeRadius(p_value: Integer): Void {
        for (i in [0..sizeof hbox.content - 1]) {
            //hbox.content.Radius = p_value; // ERROR: cannot find symbol - symbol: variable Radius - location: class javafx.scene.Node
println("{hbox.content[i]}");
var box: Box = new Box;
box.ChangeRadius(120);
... I get an error (see code comment).
I think actually should it be not class "javafx.scene.Node" but "Circle1"?
The println writes the correct types.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

Answer 1

It is indeed a bit perplexing... At runtime, we get Circle1, so it should work.
I think the problem is that the 'content' variable of HBox is defined as Node[] and that's all the compiler sees.
So the solution is to cast the object we get to tell the compiler it is a specialized node. If the node isn't of the right type, we will get a runtime error instead...
    public function ChangeRadius(p_value: Integer): Void {
        for (c in hbox.content) {
            // Checking type...
            if (c instanceof Node)
                println("Node");
            if (c instanceof CustomNode)
                println("CustomNode");
            if (c instanceof Circle1)
                println("Circle1");
            if (c instanceof Circle)
                println("Circle");
            if (c instanceof Group)
                println("Group");
            println("");
            (c as Circle1).Radius = p_value;
//~             println("{c.Name}");
    }