该函数会判断元素是否已经高亮显示了类名，并根据查找结果执行添加或删除。
This function then determines if the element already has the class name highlight, and removes or adds based on its findings.
这个类也包括了允许你是否显示默认菜单的属性。
The class also includes properties that allow you to toggle between displaying and not displaying the default menu.
获取或设置一个值，该值指示窗体区域是否由派生的邮件类显示。
Gets or sets a value that indicates whether the form region is displayed by derived message classes.
获取或设置一个值，该值指示窗体区域是否由派生的邮件类显示。
Gets or sets a value that indicates whether the form region is displayed by derived message classes.
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