Gets the collection of externally added items that the user opted to enable for transfer in the Transfer Project Standards dialog. 
   Namespace:   Autodesk.Revit.UI.Events  
  Assembly:   RevitAPIUI  (in RevitAPIUI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2017.2 
Syntax
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Return Value
External items user wants to transfer.Remarks
 If more than one add-in has registered external items, this will report items enabled for transfer for all such add-ins. Add-ins should handle the transfer only for those items which they actually registered in the TransferringProjectStandards event.