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Dynamic Object for Image Target isnt getting spawned

Hey. Currently following this tutorial below: 

https://library.vuforia.com/unity-extension/working-vuforia-engine-and-unity

I dont want to work with Vuforias normal placement. I want to catch the signal, activate a button which then can be pressed to place the object. So i wrote my script following the one i linked. For testing purposes i didnt made any changes yet. But the object (normal cube) isnt getting instantiated? Its not showing up and i dont see the object in the hierarchy either when testing with my webcam. As discribe by the link i just have a normal Image Target with the componten Image Target Behaviour & ARManager (my script that inheriets vom DefaultObserverEventHandler) on it. Even the Debug.Log in script are showing up in my consol so it seem like the script never gets called? am i missing something here?