Gnats 6062: Deleting and Moving Custom Slots from an AggObj Element Object
Bug Number: 6062
Release notes (y/n): Yes
For Release Nums: 7.2

Gnats 6062:  Can't delete custom slots from elements of an aggregate object, 
 nor move them to a different object.

See deletion fix in method:
  okstat OpenObjectDlg::deleteSlotHelper (Slot*);

See move fix in method:
  void OpenObjectDlg::moveSlotsToObj();

The  "Move Slots to Object..." action is now disabled if the slot selection 
within the Open Object Dialog or Object Viewer includes slots from more than 
one SimObj -- e.g. slots on multiple Element Objects, or an Element Object 
and the top-level Aggregate Object.

Here is an available reference screenshot.
(No changes have been made to the GUI appearance with this change).
http://cadswes2.colorado.edu/~philw/2017/bugs/6062/MoveSlotstoObjDlg1.png