Holds a pointer to the large bitmap surface that contains the small bitmaps.
__property TCustomIvorySurface* BitmapSurface;
Notes
You may specify either Bitmap or BitmapSurface, but you are not allowed to specify both of them. One of them is automatically set to zero.
BitmapSurface is usually a TIvoryBitmapSurface component, but theoretically it can be any TCustomIvorySurface descendant.