Nested HTML fields in right side panel don't have highlighted vertical bar after focus.

Scenario:

1. Go to xmas tree document in HAP and click nested HTML field in some compound field.

Problem: Vertical bar that indicates focus of entire compound field remains grey. 

Expected: Vertical bar should be blue.

Note that if you click other field type like text field in same compound field and after that back to HTML field then vertical bar becomes blue but next click to HTML field after another HTML field sets bar again to gray.