Specifies which sides of the TRSGPRectangle rectangle to display.
A side is a rectangle boundary between two adjacent corners or end points of corner customizations. End points of corner customizations are defined by XRadius and YRadius. A corner customization applies to corners included into the Corners set.
By default, all sides of the rectangle are displayed.
Sides can contain a set of constants defined in TRSSide: sdTop, sdLeft, sdBottom, and sdRight. Use the AllSides constant to select all sides.
If Sides is empty, then no side is displayed.