internal DefaultTypeDescriptor(TypeDescriptor.TypeDescriptionNode node, Type objectType, object instance)
 {
     this._node = node;
     this._objectType = objectType;
     this._instance = instance;
 }
 internal DefaultExtendedTypeDescriptor(TypeDescriptor.TypeDescriptionNode node, object instance)
 {
     this._node = node;
     this._instance = instance;
 }