Scratch my last thought. It is easier to select one or more components and then right click and choose Lock/Unlock.
I don’t want to get into providing a method for selecting a cabinet and/or any of its sub-assemblies on the toolbar. That would take about six icons. I would favor never locking the cabinets or your original proposal to Lock or Unlock an entire cabinet based on the component selected. Greg, is this the kind of thing we should put to all users in an email?