Transparent images are pure evil in Windows Forms, that why I've created a custom control class to handle them. The designer doesn't show my control when it's empty. I would like to add a subtle border, but only in the design view (and when no border is added by the user). How would I do this?Transparent images are pure evil in Windows For
阅读背景：
如何在设计视图中向自定义控件添加边框?
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