How can I click GUI Buttons in CAVE with Middle VR Xbox Controller?

Recently, I encountered a problem of GUI in CAVE, but  hard to solve, I wonder if anybody have any experience on this.
The case is that I set a UI Canvas in the Unity Program, and some Buttons to click. I can easily click those buttons with my mouse in PC, but in CAVE, I can't click it with Middle VR controller.
I have checked the official guide, and set the Canvas to "world space" according to it, but it didn't help.
Anyone could give me some suggestions on this? I really need some help.
Thanks a lot!


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