How to reproduce:
Add a RadContextMenu and an ImageList to a form, then add some images to the image list and set the ImageList property of the context menu to equal the image list object. Add some items and sub items to the context menu. Setting the image index of a sub item is not reflected by the context menu.

Workaround:
   1. Design time: and the images as resources and set the image property of each item
   2. Set the image index of the sub items at runtime