Move focus from Rack to chains within Rack via keyboard?

[onslaught]

So one can navigate with the arrow keys to move focus to different devices, but how do you move into the chains within a rack?



I discovered how to move out of the chains using 'Escape' key.



But after trying various key combos, I cannot navigate into the racks chains via keyboard. Is there a key combo for this? Or is it just use the mouse at the moment?