Why properties you add to a custom .NET user control appear bold in propertygrid?

Usually, only modified control properties are bold.

But in this scenario, I've created a custom user control and add开发者_运维百科ed a public property to it. When I add it to any container and open the properties window, all properties I've added appear also bold - despite the default value.

Why does this happen and how to prevent it?

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Try to add the DefaultValueAttribute to the properties and set it to the value that you don't want to appear bold.