Stop clicks on reaching gameobjects

I register the click event to stop propagation but it still reaches gameobjects behind the uidocument:

Code (CSharp):

1. UIDocument u = gameObject.GetComponent<UIDocument>();
2. u.rootVisualElement.RegisterCallback<ClickEvent>(e => e.StopImmediatePropagation());

Code (CSharp):

1. UIDocument u = gameObject.GetComponent<UIDocument>();
2. u.rootVisualElement.RegisterCallback<ClickEvent>(e => e.StopPropagation());

 

My guess is, it stops only the click within the UIToolkit System, but the klick event in the 3D world and the old system is still there.
I think since it has it's own EventHandler, a click creates one clickevent for each of them which have no effect on each other.

 

thanks!