CM15A & Wireless Cameras

[birdzeye]

Are wireless cams supposed to work with the CM15A? Because unless I have the TM751 also plugged in, only one wireless camera will show up on the preview screen. Also, at the bottom of the preview screen where there are tabs for each camera, all the cameras can be viewed in only one camera's tab by switching with a remote control. I thought each tab at the bottom of the preview screen was supposed to be for ONE camera ONLY.