Sets the collection of externally added items which should be shown in the Transfer Project Standards dialog as options. 
   Namespace:   Autodesk.Revit.UI.Events  
  Assembly:   RevitAPIUI  (in RevitAPIUI.dll) Version: 22.0.0.0 (22.1.0.0) 
  Since:  2017.2 
Syntax
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Parameters
- externalItems
-  Type:  System.Collections.Generic IDictionary   Guid  ,  String  
 The external items which are displayed in the Transfer Project Standards UI. GUIDvalue is used to identify the external item string.
Remarks
 The externally added items that the user opted to transfer will be reported in the args to the TransferredProjectStandards event. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was null |