[mdr-users] method annotation with attribute that refers to another annotation type

I need to reverse engineer a method annotation that has an attribute 
whose value is another annotation type, like this:
@Function(result=@FunctionResult(displayName="String Concatenator" ) )

But I'm getting null back from annotation.getAttributeValues(). 

How can I get the value of the "displayName" in the above example?

Thanks,
--Jeri