JavaFX Program to display IE Favorites web pages

import javafx.stage.Stage;

import javafx.scene.Scene;
import javafx.scene.paint.Stop;
import javafx.scene.paint.Color;
import javafx.scene.effect.DropShadow;
import javafx.scene.paint.LinearGradient;
import java.lang.System;

import com.javafx.preview.control.TreeItem;
import com.javafx.preview.control.TreeItemBase;
import com.javafx.preview.control.TreeView;
import java.io.*;
import java.lang.String;



var w = 500;
var h = 300;

var tree = TreeView {
        effect:DropShadow{offsetY:3 offsetX:3}
    root: TreeItem {

        def home_name = System.getProperty("user.name");
        data: new File("C:/Documents and Settings/{home_name}/Favorites")
        expanded:false
        //isLeaf: isLeaf
        createChildren: createChildren;
    }
}



function createChildren(item:TreeItemBase):TreeItemBase[] {
    def file = item.data as File;

    if (file.isDirectory()) {
        return for (f in file.listFiles())
        {
           
            TreeItem {

                var xz = f.split("/"); // <-- this wont work
                data: xz[1];

                createChildren: createChildren;
                //isLeaf: isLeaf;

            }
        }

    }
   
    return [];

}