WPF Border Thickness increase direction?

Well, actually you should set the width and height on the inner or outer control of the border, not on the border itself. Then you can set a negative margin for the border, equal to minus the value of the border thickness. Something like this should to the trick: Border x:Name="myBorder" Background="AliceBlue" Margin="-10,-10,-10,-10" BorderThickness="10" BorderBrush="Black.

Well, actually you should set the width and height on the inner or outer control of the border, not on the border itself. Then you can set a negative margin for the border, equal to minus the value of the border thickness. Something like this should to the trick.

It looks like you need to increase Width and Height accordingly.

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