This element acts as a multi-segmented Grid. The individual grids associated to the MultiSegmentGrid behave as a single unit and all share the same text. They inherit their type (GridType) from the MultiSegmentGrid. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2013