We've added an accelerator key (hotkey), a tool tip, and an image (the tool tip won't show up on menu items, but it will on toolbar items, which we'll see later).
我们添加了一个加速键(热键)、一条工具提示和一个图像(工具提示不会在菜单项上显示，但会在工具栏项上显示，稍后将看到这一点)。
The framework calls this member function when the user selects an item from a menu, when a child control sends a notification message, or when an accelerator keystroke is translated.
当用户从菜单中选择了一项，或者子控件发出一个通知消息，或者转换了一个加速键的击键事件，框架就调用这个成员函数。
After people started to regard the toolbar as something more than just an accelerator for the menu, its growth potential became more apparent.
在人们开始意识到工具栏不仅仅是菜单的快捷方式后，它的成长潜力更明显了。
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