This example demonstrates how to override GridViewImageColumn's distinct values to be images and not a string path.
See also:
WPF: http://docs.telerik.com/devtools/wpf/controls/radgridview/columns/columntypes/image-column.html
SL: http://docs.telerik.com/devtools/silverlight/controls/radgridview/columns/columntypes/image-column.html
