How to use GraphicRaycaster.Raycast?

I'm writing a selection manager for a 2D sprite based game and want the new UI to block raycasts. Idea is to Raycast against UI and there is a method for that, but how do I use it. Where do I get eventData to feed into it?

Code (csharp):

1. public void Raycast(PointerEventData eventData, List<RaycastResult> resultAppendList);

http://docs.unity3d.com/460/Documentation/ScriptReference/UI.GraphicRaycaster.Raycast.html

EDIT:
A workaround I'm using right now is having 2D trigger colliders attached to stuff under Canvas. Then I use Physics2D.OverlapPointAll(Camera.main.ScreenToWorldPoint(Input.mousePosition)) and block click processing in selection manager if that hit some collider under Canvas.

 

I want to raycast against a worldspace UI in VR with Oculus Touch controllers and also need GraphicRaycaster.Raycast.
Also need an example.

 

@Cascho01

Hi, not sure if this will help in your case, I don't know what doesn't work for your with GraphicRaycaster - But it's a component, you get it, then use it - and here's an example how to use it:

https://gamedev.stackexchange.com/questions/93592/graphics-raycaster-of-unity-how-does-it-work