Maximum coordinates (upper-right-front corner of the pick box). 
   Namespace:   Autodesk.Revit.UI.Selection  
  Assembly:   RevitAPIUI  (in RevitAPIUI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Namespace:   Autodesk.Revit.UI.Selection  
  Assembly:   RevitAPIUI  (in RevitAPIUI.dll) Version: 2015.0.0.0 (2015.0.0.0)