Why doesn't this decorator work? From the example with "addClass" here http://wiki.fluidproject.org/display/docs/Renderer+Component+Tree+Expanders#RendererComponentTreeExpanders-ConditionExpander (scroll down a bit), isn't "mediumImage" a selector name? As is "moreLessIcon".

This decorator is needed so that the icon of more/less is generated (by addind appropriate class) according to the value of the more/less boolean in the model.