BackSurface is a pointer to the backbuffer surface.
__property TCustomIvorySurface* BackSurface;
Description
The backbuffer surface is a special surface. You draw everything on he backbuffer that you want to be shown on the screen. Use the Flip method to copy the backbuffer to the screen. It is not recommended to draw directly on the screen, because it would cause flickering. Draw on the backbuffer instead.