The message that has been displayed in the dialog box.
Namespace: Autodesk.Revit.UI.Events
Assembly: RevitAPIUI (in RevitAPIUI.dll) Version: 2015.0.0.0 (2015.0.0.0)
Since: 2010
Namespace: Autodesk.Revit.UI.Events
Assembly: RevitAPIUI (in RevitAPIUI.dll) Version: 2015.0.0.0 (2015.0.0.0)
Since: 2010