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The BorderColors property sets the colors for the control when its Border property has been set to Custom Thick or Custom Thin. If it is a Custom Thick border, then the border is 2-pixels wide and you can set the outer pixels and inner pixels independently. If it is a Custom Thin border, then only the outer pixel color is used and the inner color is ignored. You are not limited to solid colors. Each border can be set to a valid ColorFillColor Fill string, so you can even apply gradients.
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