Bug 299536 API refers to non-API type UIResourceFilterDescription
I20100112 CreateGroupOperation and CreateFolderOperation have constructors that require a UIResourceFilterDescription[]. However this is a non-API type, so clients can't reference it without using internals. Either the constructor should be removed or something like UIResourceFilterDescription needs to be promoted to API. Also, shouldn't CreateFolderOperation be renamed CreateVirtualFolderOperation?
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/dialogs/WizardNewFolderMainPage.java
* </p>
	 * <p>
	 * Note that this page caches the new folder once it has been successfully
	 * created; subsequent invocations of this method will answer the same
	 * folder resource without attempting to create it again.
	 * </p>
	 * <p>
	 * This method should be called within a workspace modify operation since it
	 * creates resources.
	 * </p>
	 * 
	 * @return the created folder resource, or <code>null</code> if the folder
	 *         was not created
	 */
	public IFolder createNewFolder() {
		if (newFolder != null) {
			return newFolder;
		}
		
		final IPath containerPath = resourceGroup.getContainerFullPath();
		IPath newFolderPath = containerPath.append(resourceGroup.getResource());
		final IFolder newFolderHandle = createFolderHandle(newFolderPath);
		final boolean createVirtualFolder = useVirtualFolder != null && useVirtualFolder.getSelection();
		createLinkTarget();
		IRunnableWithProgress op = new IRunnableWithProgress() {
			public void run(IProgressMonitor monitor) {
				AbstractOperation op;
				op = new CreateFolderOperation(
					newFolderHandle, linkTargetPath, createVirtualFolder, filterList,
					IDEWorkbenchMessages.WizardNewFolderCreationPage_title);