The simple sentiment classification task should display the resource being annotated, as well as it's sub resources. It appears that what the task displays for annotating are the sub resources of the selected resource, just concatenated together. The view should also give some indication of the resource to which the annotation is being applied. Also, if you select a resource to annotate that does not have sub resources then the task will not display anything.
Trac #418.
This issue is important mostly to make demoing the system more useful and intuitive.