提示：要使项目一次移动一个像素，则选择该项目并按下键盘上的箭头键。
TIP: To move an item one pixel at a time, select the item and press an arrow key on your keyboard.
当用户使用键盘上的箭头键滚动到菜单项上来突出显示该菜单项时，也可引发该事件。
The event can also be raised when the user highlights a menu item using the keyboard by scrolling to the menu item with the arrow keys.
当用户使用键盘上的箭头键滚动到菜单项上来突出显示该菜单项时，也可引发该事件。
The event can also be raised when the user highlights a menu item by using the keyboard to scroll to the menu item with the arrow keys.
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