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
ImageDescriptor folderDescriptor = PlatformUI.getWorkbench().getSharedImages().getImageDescriptor(
	                ISharedImages.IMG_OBJ_FOLDER);
			ImageDescriptor[][] linkedResourceOverlayMap = new ImageDescriptor[4][1];
			linkedResourceOverlayMap[1]= new ImageDescriptor[] {AbstractUIPlugin.imageDescriptorFromPlugin(
					IDEWorkbenchPlugin.IDE_WORKBENCH,
			"$nl$/icons/full/ovr16/link_ovr.gif")}; 
			
			CompositeImageDescriptor linkedFolderDescriptor = new OverlayIcon(folderDescriptor, linkedResourceOverlayMap, new Point(16, 16)); 
			ImageDescriptor[][] virtualFolderOverlayMap = new ImageDescriptor[4][1];
			virtualFolderOverlayMap[1]= new ImageDescriptor[] {AbstractUIPlugin.imageDescriptorFromPlugin(
					IDEWorkbenchPlugin.IDE_WORKBENCH,
				"$nl$/icons/full/ovr16/virt_ovr.gif")}; 
			CompositeImageDescriptor virtualFolderDescriptor = new OverlayIcon(folderDescriptor, virtualFolderOverlayMap, new Point(16, 16)); 
			Image folderImage = folderDescriptor.createImage();
			useDefaultLocation = new Button(advancedComposite, SWT.RADIO);
			int indent = useDefaultLocation.computeSize(SWT.DEFAULT, SWT.DEFAULT).x;
			useDefaultLocation.setFont(advancedComposite.getFont());
			useDefaultLocation.setText(IDEWorkbenchMessages.useDefaultLocation);
			useDefaultLocation.setImage(folderImage);
			GridData data = setButtonLayoutData(useDefaultLocation);
			data.horizontalAlignment = GridData.BEGINNING;
			data.horizontalIndent = indent;
			useDefaultLocation.setLayoutData(data);
			Image virtualFolderImage = virtualFolderDescriptor.createImage();
			useVirtualFolder = new Button(advancedComposite, SWT.RADIO);
			useVirtualFolder.setFont(advancedComposite.getFont());
			useVirtualFolder.setImage(virtualFolderImage);
			useVirtualFolder.setText(IDEWorkbenchMessages.createVirtualFolder);
			data = setButtonLayoutData(useVirtualFolder);
			data.horizontalAlignment = GridData.BEGINNING;