Never mind, we will add the necessary classes using JavaScript instead. But you should really use a proper template system instead of rendering HTML in your classes...
We are for the majority of our plugins. However for several legacy aspects of CB we aren't. The contents of CBSubs subscription tab is for the most part template driven. Some aspects are hardcoded as they need to be for a consistent output, but in the future all elements should become template files (see various plugins where I've implemented a template system for them).
I've added a feature ticket regarding a planned template class that our plugins will be able to utilize where we'll be posting our ideas. This won't be until at least 2.1 though as it's a pretty major change.
forge.joomlapolis.com/issues/5947
The idea is to also remove CSS framework dependency by pulling CSS classes from an API library so we can change to a different framework at a moments notice as needed, etc..