Clicking the Make Visibility Dynamic button creates a Visibility variable. 按一下按钮，使能见度动态创建一个可见变数。
In order to reduce memory consumption and increase running efficiency, most forms are established by means of dynamic technique. 为了减少系统资源的消耗和提高程序的运行效率，大多数窗体采用了动态创建的方法。
