VR interaction with UI

Yes, I know there is plenty post about the same question : how can I interact with my 3d UI using a VR controller.

I figure out how to create a UI in world space : UMG and VR - VR and AR Development - Unreal Engine Forums
I can have a UI local position of my virtual hand when my hand does collide with the world UI

But, how can I simulate a mouse pointer over the UI using blueprint ? And how can I send a click event through that virtual mouse pointer ?

I just want to be able to “click” on the UI using my virtual hand.

Thanks for any help.

I just found a solution to this on youtube today! UE4 HTC Vive How to setup Interaction with a menu using Motion controllers - YouTube