Hope someone can help with this one - started playing with Babylon.GUI today, and worked up to the StackPanel object. My code was throwing a 't._link is not a function' error, which I've managed to duplicate in this playground : https://www.babylonjs-playground.com/#0HC6AT
Now, the playground mentioned in the documentation (http://www.babylonjs-playground.com/#XCPP9Y#11) seems identical, but does work. I am a JS novice, so it might be something more obvious to others: but whats going on?
Cheers!