True if the pane is being activated, false if it is being inactivated.
Namespace: Autodesk.Revit.UI.Events
Assembly: RevitAPIUI (in RevitAPIUI.dll) Version: 2015.0.0.0 (2015.0.0.0)
Since: 2015
Namespace: Autodesk.Revit.UI.Events
Assembly: RevitAPIUI (in RevitAPIUI.dll) Version: 2015.0.0.0 (2015.0.0.0)
Since: 2015