public class BookmarkView extends ViewPart {

	private TreeViewer viewer;

	@Override
	public void createPartControl(Composite parent) {
		
		viewer = new TreeViewer(parent, SWT.MULTI |  SWT.H_SCROLL | SWT.V_SCROLL);
		
		int operations = DND.DROP_LINK;
		Transfer[] transferTypes = new Transfer[] { TextTransfer.getInstance(),
				ResourceTransfer.getInstance() };

		TreeModel model = new TreeModel();
		viewer.addDropSupport(operations, transferTypes, new TreeDropListener(
				viewer, model));
		viewer.addDragSupport(operations, transferTypes, new TreeDragListener(
				viewer));
		viewer.setContentProvider(new TreeContentProvider());
		viewer.setLabelProvider(new TreeLabelProvider());
		viewer.setInput(model.getModelRoot());
		

		ColumnViewerEditorActivationStrategy actSupport = new ColumnViewerEditorActivationStrategy(
				viewer) {
			protected boolean isEditorActivationEvent(
					ColumnViewerEditorActivationEvent event) {
				return event.eventType == ColumnViewerEditorActivationEvent.TRAVERSAL
						|| event.eventType == ColumnViewerEditorActivationEvent.MOUSE_DOUBLE_CLICK_SELECTION
						|| (event.eventType == ColumnViewerEditorActivationEvent.KEY_PRESSED && event.keyCode == SWT.CR)
						|| event.eventType == ColumnViewerEditorActivationEvent.PROGRAMMATIC;
			}
		};

		TreeViewerFocusCellManager focusCellManager = new TreeViewerFocusCellManager(
				viewer, new FocusCellOwnerDrawHighlighter(viewer));
		
		TreeViewerEditor.create(viewer, focusCellManager, actSupport,
				ColumnViewerEditor.TABBING_HORIZONTAL
						| ColumnViewerEditor.TABBING_MOVE_TO_ROW_NEIGHBOR
						| ColumnViewerEditor.TABBING_VERTICAL
						| ColumnViewerEditor.KEYBOARD_ACTIVATION);

		final TextCellEditor textCellEditor = new TextCellEditor(
				viewer.getTree());

		
		TreeViewerColumn column = new TreeViewerColumn(viewer, SWT.MULTI);
		column.getColumn().setWidth(100); //<------- Requires fixed pixel value?????
		column.getColumn().setMoveable(true);
//		column.getColumn().setText("Name");
		column.setLabelProvider(new TreeLabelProvider());
		column.setEditingSupport(new EditingSupport(viewer) {
			protected boolean canEdit(Object element) {
				return true;
			}

			protected CellEditor getCellEditor(Object element) {
				return textCellEditor;
			}

			protected Object getValue(Object element) {
				if (element instanceof TreeNode) {
					return ((TreeNode) element).getText();
				}
				return element.toString();
			}

			protected void setValue(Object element, Object value) {
				if (element instanceof BookmarkNode) {
					((BookmarkNode) element).setText(String.valueOf(value));
				}
				viewer.update(element, null);
			}
		});
		

TreeViewerEditor.create(viewer, focusCellManager, actSupport,
				ColumnViewerEditor.TABBING_HORIZONTAL
						| ColumnViewerEditor.TABBING_MOVE_TO_ROW_NEIGHBOR
						| ColumnViewerEditor.TABBING_VERTICAL
						| ColumnViewerEditor.KEYBOARD_ACTIVATION);

		final TextCellEditor textCellEditor = new TextCellEditor(
				viewer.getTree());
		

		TreeViewerColumn column = new TreeViewerColumn(viewer, SWT.MULTI | SWT.FULL_SELECTION | SWT.H_SCROLL | SWT.V_SCROLL);
		column.getColumn().setWidth(100);
		column.getColumn().setMoveable(true);
		column.setLabelProvider(new TreeLabelProvider());
		column.setEditingSupport(new EditingSupport(viewer) {/*.....*/}