//final IFolder fContainer = new WGADesignStructureHelper(activeFile).getFileContainer(containername);
final IFolder fContainer = WGADesignStructureHelper.findReferencedFileContainer(activeFile, containername);
if (fContainer != null) {
final Set<String> fReferences = references;
try {
fContainer.accept(new IResourceVisitor() {
public boolean visit(IResource resource) throws CoreException {
if (resource instanceof IFile) {
fReferences.add(resource.getName().toLowerCase());
return true;