Widget Interaction

Hello,I’m using the UE 4.13 now and the Widget Interaction Component works greet!
But here is a problem I don’t know how to solve.
As known, Widget Interaction Component just like post a ray cast to the 3D Widget in the world,but I don’t know the ray channel(trace channel )of the Widget Interaction Component.
Is there any selection that I could change the trace channel of the Widget Interaction Component?
Cause I have some issues when interacting with a 3D Widget behind a translucent object.
Thank you.
Looking forward to your replies.