https://resources.arcgis.com/en/help/runtime-wpf/apiref/ESRI.ArcGIS.Client.Toolkit~ESRI.ArcGIS.Client.Toolkit.Primitives_namespace_hierarchy.html
ESRI.ArcGIS.Client.Toolkit.Primitives Namespace Inheritance Hierarchy
esri arcgisclient toolkitprimitivesnamespaceinheritance