private Item equipItemListWithItem() throws Exception {
   Item result = equipWithItems(timeline, new Item("id", 20L) {});
   showShell(shell);
   SwtItemUi<Item> itemUi = stubItemUi(newChildComposite(itemUiList.getUiRoot()));
   map(itemUiMap, result, itemUi);
   return result;
 }
 private void triggerScrollbarSelectionChange(int newValue) {
   ScrollBar verticalBar = ((ScrolledComposite) itemUiList.getUiRoot()).getVerticalBar();
   verticalBar.setSelection(newValue);
   SwtEventHelper.trigger(SWT.Selection).withDetail(newValue).on(verticalBar);
 }