BorderLeft Property
DirectX Only
In conjunction with BorderTop, BorderBottom and BorderRight, BorderLeft defines the thickness of the border displayed around a control.
Borders consume part of the control when applied. This is particularly relevant when applying a style with top and left borders on MouseOver. The top and left borders will effectively cause the 0, 0 coordinates to move resulting in child control moving screen position.
Background features of a Style are not inherited by child controls. This ensures that a background applied to a form is not repeated verbatim on child controls.