Bug 296565 Make group creation an advanced option in the folder
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/dialogs/WizardNewGroupMainPage.java
private static final int SIZING_CONTAINER_GROUP_HEIGHT = 250;
    private IStructuredSelection currentSelection;
    private IFolder newGroup;
    
    private ResourceAndContainerGroup resourceGroup;
    /**
     * Creates a new group creation wizard page. If the initial resource selection 
     * contains exactly one container resource then it will be used as the default
     * container resource.
     *
     * @param pageName the name of the page
     * @param selection the current resource selection
     */
    public WizardNewGroupMainPage(String pageName,
            IStructuredSelection selection) {
        super("newGroupPage1");
        setTitle(pageName);
        setDescription(IDEWorkbenchMessages.WizardNewGroupMainPage_description);