property Chart.PictureDisplay as PictureDisplayEnum
Retrieves or sets a value that indicates the way how the graphic is displayed on the chart's background

TypeDescription
PictureDisplayEnum A PictureDisplayEnum expression that indicates the way how the picture is displayed in the chart's area. 
By default, the PictureDisplay property is exTile. The PictureDisplay property specifies how the Picture is displayed on the chart's background. If the chart has no picture associated the PictureDisplay property has no effect. Use the CellPicture property to assign a picture to a cell. Use the BackColor property to specify the control's background color. Use the BackColor property to specify the chart's background color.