Sorry about that, I didn't even notice the code until I looked again. Your macro should read
{%ClassName%}.<TransformationName>
The problem with what you entered was {%ClassName} wouldn't return anything because it didn't have the closing %.
The macro "ClassName" won't do anything with transformations, it simply is a dynamic property based on the document being rendered at the time. If you were to look at the fully rendered text, it would be something like
cms.article.previewlist
OR
cms.news.previewlist
The value "previewlist" is the actual code name you give it when you create it in the document types transformation tab.