solved CreateGUITexture? Is it outdated?

[fateriddle]

https://playground.babylonjs.com/#22KIIK
In this playground, I see use of  "createGUITexture"  a lot, but when plug into my code, it seems createGUITexture is not a function... why?

I've tried 

import * as BABYLON from 'babylonjs'
import * as GUI from 'babylonjs-gui'
import 'babylonjs-loaders'

GUI.createGUITexture( ... )
BABYLON.createGUITexture( ... )

But it seems none of the namespace has this method...

[aWeirdo]

Hi..
It's a javascript function declared in the PG, not a part of babylonJs GUI.

function createGUITexture(planeName, planeSize, planePosition) {
    var plane = BABYLON.Mesh.CreatePlane(planeName, planeSize, scene);
    plane.position = planePosition;
    var GUITexture = BABYLON.GUI.AdvancedDynamicTexture.CreateForMesh(plane);
    return { GUITexture: GUITexture, plane: plane};
}