CakeDC Comments Plugin - How is the $comment variable put together?

I'm trying to figure out how the $comment variable is put together in the Comments Plugin from CakeDC. I need the variable to contain a new column that I've added to the table and also the data from a different model which I've attached via a component (Ratings).

I've tried following the CommentWidgetHelper to figure out where the $comment variable was put together, but I get lost in the main.ctp file under View\Elements\comments\threaded. This is the view that generates the comment-tree. This view passes a variable called: ${$viewComments} . I have no idea where this comes from and what it means, but it does seem to be a bottleneck, since it only contains a limited amount of fields from the comments table. Can someone please explain to me the double dollar sign and show me where this variable comes from? 

If I was unclear, feel free to ask, I'll be glad to provide further information.

Thanks in advance!

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