Transfer[] transfer = new Transfer[] { SeriesTransfer.getInstance() };
		treeViewer.addDragSupport(DND.DROP_COPY, transfer,
				new DragSourceAdapter() {

					@Override
					public void dragStart(DragSourceEvent event) {
						System.out.println("start");
					}

					@Override
					public void dragSetData(DragSourceEvent event) {
						System.out.println("set");
					}

					@Override
					public void dragFinished(DragSourceEvent event) {
					}

				});

checkboxTableViewer.addDropSupport(DND.DROP_COPY, transfer,
				new ViewerDropAdapter(checkboxTableViewer) {

					@Override
					public void drop(DropTargetEvent event) {
						System.out.println("drop");
						super.drop(event);
					}

					@Override
					public boolean performDrop(Object data) {
						System.out.println("perform");
						return true;
					}

					@Override
					public boolean validateDrop(Object target, int operation,
							TransferData transferType) {
						System.out.println(transferType.type);
						return true;
					}

				});

public class SeriesTransfer extends ByteArrayTransfer {

	private static final String TYPE_NAME = TimeSeries.class.getName();
	private static final int TYPE_ID = registerType(TYPE_NAME);
	private static SeriesTransfer instance;

	private SeriesTransfer() {
	};

	public static SeriesTransfer getInstance() {
		if (instance == null)
			instance = new SeriesTransfer();
		return instance;
	}

	@Override
	protected int[] getTypeIds() {
		return new int[] { TYPE_ID };
	}

	@Override
	protected String[] getTypeNames() {
		return new String[] { TYPE_NAME };
	}

	@Override
	public boolean isSupportedType(TransferData transferData) {
		return super.isSupportedType(transferData);
	}
}