This will adjust the thickness for all 4 sides of the Border.
Note, however, that in addition to setting this property, the BorderBrush property must not be null or set to Transparent for the Border to appear.
Target Platforms: Windows 11, Windows 10, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2