Defines how an image is positioned within a cell.
public enum GridBackgroundImageMode
The image is displayed in the center if the cell is larger than the image. If the image is larger than the cell, the picture is placed in the center of the cell and the outside edges are clipped.
The image is placed in the upper-left corner of the cell. The image is clipped if it is larger than the cell it is contained in.
The image within the cell is stretched or shrunk to fit the size of the cell.
The image is tiled across the Cell rectangle.