Translation Memory Updates - changing the settings

How do I change the settings for translation memory updates through the API? See the attachment for the dialogue I'm referring to. In Trados, you get there by selecting the project, right click, Batch Tasks > Update Main Translation Memories > click next until you come to Settings.


There's some samples on

http://producthelp.sdl.com/SDK/ProjectAutomationApi/3.0/html/29374aca-0a1f-49d1-bcb9-021fb3996575.htm

but it doesn't refer to these settings. For example, the AlwaysAddNewTranslation property is not available, see attachment.