When a user selects a menu item from a designer context menu, the custom handler is called to execute the verb associated with the menu item.
当用户从设计器上下文菜单中选择菜单项时，系统将调用该自定义处理程序，以执行与该菜单项关联的谓词。
An integer for passing custom information to a menu item.
传递自定义信息到一个菜单项的整数。
This allows you to provide an event handler that performs a custom routine, such as adding custom content or modifying a menu item before it is rendered, whenever this event occurs.
这可让您提供事件处理常式，以便在每次发生这个事件时执行自订常式，例如加入自订内容或在呈现功能表项目前加以修改。
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