It is fairly easy to put on a menu item, but more difficult to put on a toolbar control, although putting the explanation in a ToolTip is a good compromise (see Chapter 23 for more about toolbars and ToolTips).

• 将解释性撤销放在菜单项中很容易，但放在工具栏控件上会比较困难，虽然将解释性撤销放在工具提示（见第23章）中是一种很好的折中。