The 'imageindex' property

Integer scalar

Valid for: Image, and (except under MacOS), for Menu, Page

If you have defined an ImageList for a pop-up Menu, window Menu, or Selector control, the imageindex property determines (for each child Menu item or Page control) the particular image in the list which will be displayed. Its value is the index (in origin 1) of the image within the list. A value of 0 means no image is displayed. It is not available under MacOS.

For an Image object, the imageindex property determines the index of the currently-active image, starting at 1.