In the MSDN documentation, it documents that you can set the UpdateSourceTrigger to an event of your choosing…
MSDN UpdateSourceTrigger Documentation
I can’t seem to get this to work in Silverlight, as it is seems to want either Explicit or Default…
If this is only for WPF – how can you tell from the documentation that Silverlight is excluded?
The UpdateSourceTrigger is not an event, but an enumeration.
See http://msdn.microsoft.com/en-us/library/system.windows.data.updatesourcetrigger.aspx
So, what you are seeing are the choices available to Silverlight.