Why is ExtendedTimeZone not recognized when using .NET Micro Framework 4.0?

Question

First example in the book (Expert .NET Micro Framework - 2nd Edition) uses Microsoft.SPOT.ExtendedTimeZone to set the time zone, but I get a "Cannot resolve symbol 'ExtendedTimeZone'" error in Visual Studio 2008.

I've installed the .NET Micro Framework 4.0 SDK. I referenced Microsoft.SPOT.Native.dll and Microsoft.SPOT.Hardware. I'm "using" Microsoft.SPOT and Microsoft.SPOT.Hardware.

What am I missing here?

PS: Microsoft MSDN tells me the class is available in NETMF 4.0: http://msdn.microsoft.com/en-us/library/ee433569.aspx