Release 10.1A: OpenEdge Development:
ADM Reference

GroupAssignHidden

Property used to verify whether the object is hidden and if it can remain hidden.

Data type: Logical

Notes:

Read only.
This property is used by the linkState procedure in the data.p file to verify that the link can be deactivated and how to republish the message.
Returns FALSE as soon as any visible object is found.
This property is also used to verify whether all GroupAssignTargets are hidden and if they should remain hidden.