According to your XML file, VeriStand is working correctly.
You only have the main page in your custom device, there is no extra pages.
The missing function for you is having the outputs and inputs channels.
Check also this post Programmatically adding VS custom device
I supose your initialization VI is correct, because you sent a image with the channel list. Check the SDF when you add manually the custom device if the GUID for the channels are listed there.
Now that you have the custom device reference, try to navigate to the section and add the channels. But you need the channels GUID information.
Guilherme Correa