Specifies the color of the border at the edge of the control.
Use DisplayOptions to hide the border.
Note: ◼BorderColor specifies the border of the control, use FrameColor to specify the color of the frame around the curve box ◼You must call Update after changing colors ◼If a standard color, such as clWindowFrame is used, it may be overridden by VCL theming colors. Set EnableTheming to false to prevent this