property Chart.Picture as IPictureDisp
Retrieves or sets a graphic to be displayed in the chart.

IPictureDisp A Picture object that's displayed on the control's background.
By default, the chart has no picture associated. The control uses the PictureDisplay property to determine how the picture is displayed on the chart's background. Use the PictureLevelHeader property to specify the picture on the control's levels header bar. Use the CellPicture property to assign a picture to a cell. Use the BackColor property to specify the control's background color. Use the Picture property to assign a picture on the control's background.