The border thicknes is a composite property of the left, top, right and bottom thicknesses (notice the difference in order from CSS). If you specify only one value you set all of them, but you can specify them separately:
BorderThickness="1,2,3,4"
The border thicknes is a composite property of the left, top, right and bottom thicknesses (notice the difference in order from CSS). If you specify only one value you set all of them, but you can specify them separately:
BorderThickness="1,2,3,4"