// use index for internal objects as well,
//otherwise label and description user data are not available (content assist)
IResourceDescription rd = services.getResourceDescriptionManager()
.getResourceDescription(resource);
Iterable<IEObjectDescription> allDescriptions = rd.getExportedObjects();
return new MultimapBasedSelectable(allDescriptions);
// return super.internalGetAllDescriptions(resource);
}