Question UI Toolkit New Input System / ClickEvent not working

Hello,

I am not able to connect a button click on a UI with a callback.
The UI has a button "TestButton".
In C# on the GameObject 'MainMenu' that uses the UI Document with the uxml I use the following code to find and register to the button:

Code (CSharp):

1. _root = _xml.rootVisualElement;
2. var testButton = _root.Q<Button>("TestButton");
3.  
4. //Register
5. testButton.RegisterCallback<ClickEvent>((evt) => { Debug.Log($"Clicked on '"); });

When I debug, the Button gets found (strangely with width:NaN) and the registercall back line is fine.
But If I click the button nothing happens. In Event debugger, the ClickEvent gets raised



I am using the 'New Input System' if this is somehow related.
I had to add an EventSystem and the 'Input System UI Module'

 

So after searching around the forum I found the error.
It was conflicting with my player input asset. After reloading and using the solution at https://forum.unity.com/threads/ui-doesnt-responds-with-custom-input-assets.1137406/
it works now.

Cheers