Here's how I do mine:
Configuration:The top level "Radio" item
This plays the current Play Doctor prescription
You can also save a Play Doctor configuration from Standard View as a Play Chart and play the Play Chart from Theater View.
When you save one of these, they are placed in a playlist group called Play Doctor. These are kind of handy as you can save different playcharts based on things such as genre or decade, and pick from them later, akin to saved radio stations. This next item shows all the saved play charts in the Play Doctor playlist group.
Finally, I have some online radio streams saved directly in my library. If you decide to go this route, you really need to choose a way to tag them, then exclude them from all audio views you wouldn't want them in (all of them in my case) except of course, your "Online Radio" views.
The "Set rules for file display"
How it looksSee the attached images for theater view screenshots of the thing in action. Note that the backgrounds and on-screen prompts are a part of the theme that I use, modded for my particular theatre view set up.