Release 10.1A: OpenEdge Development:
ADM Reference

linkState

Receives messages when an object linked to this object becomes active or activeTarget (when it is viewed) or inactive or inactiveTarget (when it is hidden).

Location: toolbar.p

Parameters:

INPUT PARAMETER pcState AS CHARACTER

State of a linked object. Valid states are:

active
activeTarger
inactive
inactiveTarget
Notes: Resets panel buttons to reflect the state of the object.