assert contentDisplay != null;
this.contentDisplay = contentDisplay;
this.viewModel = new DefaultViewModel(contentDisplay,
new SlotMappingConfiguration(), selectedResource,
highlightedResources, new DefaultSlotMappingInitializer(),
viewItemBehavior, new ResourceGrouping(
new ResourceByUriMultiCategorizer(),
new DefaultResourceSetFactory()), Logger.getLogger(""));
setWidget(contentDisplay.asWidget());