Detect mouse input from BACKSIDE of World Space canvas?

Hello forum,

I have placed a World Space canvas in the scene, with some buttons and sliders on, then realized that they don't get mouse inputs when they're seen from the back.

• I need a World Space canvas or UI components to detect mouse inputs from both sides.
• I need to keep using IBeginDragHandler, IDragHandler, etc, since all my own UI components rely on that system.

How do you get around this problem?

Thank you,
ryo0ka