Func_monitor does not work in TF2

[jkh13]

Hi, I am trying to get the entities func_monitor and point_camera working on my TF2 map. I have created both entities, tied them together and created a brush face with the monitor material but it the camera still does not work, nothing shows up on the screen. I edited the TF2 fgd by copying the bits about the camera entities from the HL2 fgd and pasting it into the TF2 one and I assumed it would work because those entities work with CSS.