The layout was somewhat poor - hard to see what relates to the custom object, and also weirdly we show the Wireframe toggle above the Custom Object control, even though it can only be active if a bone has a custom object set.
Instead, I grouped everything in a Custom Shape sub-panel and used greying out.
Differential Revision: https://developer.blender.org/D6789
Reviewed by Brecht van Lommel
6a841acab6